• Category: misc
• Difficulty: easy
• Author: Blue Alder

Rummaging through the ruins of an old server and next to some scissors and glue you find the remnants of what looks like a PNG file.

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Solve

• The provided file is warped.png, a corrupted PNG file? The file won’t display in normal photo apps
• Looking into the file properties nothing really stands out until binwalk discovers 3 PNG images inside the file.
• The hint mentions scissors and glue and binwalk detects 3 PNG images 1024 bytes apart.
• PNG files start with an 8 bytes signature 89 50 4E 47 0D 0A 1A 0A and end with an IEND trailer, with IDAT image data in between, all contained within warped.png, binwalk is detecting just the first 1024 chunk which contains the header.

• Using Python to separate the 1024 chunks into 3 image files reveals the flag.

chunk_size = 1024
new_images = [f"image_{i+1}.png" for i in range(3)]

with open("warped.png", "rb") as f:
	while True:
		for name in new_images:
			chunk = f.read(chunk_size)
			if not chunk:
				break
			with open(name, "ab") as out:
				out.write(chunk)
		else:
			continue
		break 

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