Disk,disk,sleuth!
Use srch_strings from the sleuthkit and some terminal-fu to find a flag in this disk image.
Download the file and decompress it with gunzip. Then use srch_strings with grep picoCTF to find the flag.
srch_strings extracts readable text from the disk image, and grep keeps lines containing the flag prefix. This can reveal plaintext stored in the image without mounting its filesystem.
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