document
Diver OSINT CTF 2025 document Challenge
Challenge description:
The US Navy Commander Fleet Activities Yokosuka (CFAY) operates a shuttle bus service between Haneda airport/Narita airport and the base for US military personnel. Answer the name of the person who created the document about the boarding location of the bus in 2023.
Flag Format: Diver25{George Washington}
https://cnrj.cnic.navy.mil/Portals/80/CFA_Yokosuka/FAQs.pdf?ver=9xaFCoTG0-tMupFtJFmcrQ%3d%3d
Okay, quick and easy challenge, my favorite. One thing you might not know about the documents you create is that it generally saves metadata about the document, including the author.
A simple tool to check a file for metadata is exiftool. Let’s use it here
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❯ exiftool FAQs.pdf
ExifTool Version Number : 13.36
File Name : FAQs.pdf
Directory : .
File Size : 512 kB
File Modification Date/Time : 2023:06:11 23:38:56-05:00
File Access Date/Time : 2025:08:27 15:46:53-05:00
File Inode Change Date/Time : 2025:06:12 21:04:03-05:00
File Permissions : -rw-r--r--
File Type : PDF
File Type Extension : pdf
MIME Type : application/pdf
PDF Version : 1.7
Linearized : No
Author : Mitchell.Donovan
Create Date : 2023:06:09 14:02:37+09:00
Modify Date : 2023:06:09 14:02:37+09:00
Producer : Microsoft: Print To PDF
Title : Microsoft Word - FAQs
Page Count : 1
And look at that, right where we hoped for it to be, the author’s name.
FLAG: Diver25{Mitchell.Donovan}