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On this page
  • TL;DR
  • Solution
  • Step 1: Analyzing the Image
  • Step 2: Identifying the Bridge
  • Step 3: Verifying the Location
  • Step 4: Confirming the Street Name
  • Step 5: Final Flag Submission
  • Final Flag
  • Notes
  1. CITCTF-2025-WRITEUPS

Timesink

CATEGORY - OSINT

PreviousSomewhere in SpaceNextThrowback to the Future

Last updated 1 month ago

TL;DR

The challenge asks for the street where a bridge in a YouTube video is located. After analyzing the bridge image, I identified the Little Nestucca River Bridge and confirmed it using coordinates and additional cross-referencing. The correct street is Little Nestucca River Road.


Solution

Step 1: Analyzing the Image

The first step was to use Google Reverse Image Search on the provided photo of the bridge.

After scrolling down, I found a high-quality version of the bridge image.

In this version of the image, I zoomed in on a sign and could read "Nestucca River." This gave me a key clue for the next step.


Step 2: Identifying the Bridge

My search results led me to a website that described the Little Nestucca River Bridge I, which seemed to match the bridge in the photo.

I found the coordinates for the bridge: 45° 6' 29.98" N, 123° 49' 26" W and plugged these into Google Maps to check if the location was accurate.


Step 3: Verifying the Location

To verify that this was the correct bridge, I cross-referenced the video still with images and information from the BTS of the Timesink music video on Instagram:

This gave me additional visual confirmation that the bridge was indeed the correct one.


Step 4: Confirming the Street Name

I searched for information on the bridge's street and found that there is a Little Nestucca River Road with a truss bridge, which matched the bridge I was analyzing.

I also searched for where Timesink by Lorn was filmed on Google, and this gave me further confirmation that I was on the right track.


Step 5: Final Flag Submission

After confirming the location, I submitted the flag:

CIT{little_nestucca_river_rd}

It was accepted!

Final Flag

CIT{little_nestucca_river_rd}

Notes

  • Reverse Image Search: Helped find a high-quality version of the bridge image, essential for identification.

  • Cross-Referencing: The Behind-the-Scenes (BTS) footage from Timesink was invaluable for confirming the bridge location.

  • Structurae Database: A top resource for structural engineering, with over 85,000 structures and 600,000 publications, it helped verify the bridge details.

The first result was interesting, so I clicked on it:

https://weareplaygrounds.nl/lorn-timesink-directed-by-pavel-brenner/