Book By Its Cover
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They say you aren’t supposed to judge a book by its cover, but this is one of my favorites!
For this challenge we are given a book.rar file to download. However running:
file book.rar
reveals that this is, in fact, a png image file. We can simply view the image to receive the flag:
This goes to show that file extensions are not always indicative of the actual file type. It is important to check in case of errors.