We are given a funnyCat.png that has content missing from the bottom, appearing to have been ‘cropped’ or corrupted.

We can use a checkpng utility to check if there are any issues with the image:

$ pngcheck ./funnyCat.png
./funnyCat.png  illegal (unless recently approved) unknown, public chunk EDAT

Generally the data blocks are IDAT not EDAT, so let’s fix that in a hex editor.

Once modified we can reopen the file and get the flag:

Flag: DawgCTF{C0rrup7_Chunkz}