🔍 pngcheck CTF Tutorial: How to Analyze Corrupted PNG Files and Find Hidden Chunks Searching for "pngcheck CTF" or "how to fix corrupted PNG forensics" usually returns tool documentation or terse Writeups that skip the thinking. This article is different: it's a walkthrough of how I actually use pngcheck in CTF PNG forensics challenges — including the 30 minutes I wasted on steganography tools