Show us your ID Writeup (dCTF 2021)

panda1729

Type: Misc

Difficulty: Easy

Prompt:

Solution

This is a very straightforward challenge. But seeing the number of points anyone would spend hours analysing the pdf properly.

Skipping the time I wasted on analysing and extracting objects and reading writeups, here’s the solution.

$ strings nyan.pdf | grep id

" id="646374667b3362306261347d"?> <x:xmpmeta xmlns:x="adobe:ns:meta/" 
[.....snipped.....]

That id is the flag.

>>> bytes.fromhex('646374667b3362306261347d')
b'dctf{3b0ba4}'