Contracts - Forensics

Task

Magical contracts are hard. Occasionally, you sign with the flag instead of your name. It happens.

Solution

We get a contract.pdf file:

szczygielka@hacks$ file contract.pdf 
contract.pdf: PDF document, version 1.7, 3 page(s)

The content of the task suggests that the file was signed with a flag. There are 2 images in place of the signatures in the PDF document:

Let's extract all the images from the PDF to see if anything is interesting in them. We can do that using this website. After extraction images, we get 4 images:

One of the images, i.e. 2.png image contains a flag.

Flag:

utflag{s1mple_w1z4rding_mist4k3s}