Use the file command first to get info about the possible compression. A tar archive has the filenames included in it at the top. You can determine that it is likely to be one of those formats by looking at the first few bytes. You should then test to see if it really is one of those, using an integrity check from the associated utility for that format, or by actually proceeding to decompress. ...
Bandit Passwords PW for bandit4: pIwrPrtPN36QITSp3EQaw936yaFoFgAB bandit5: koReBOKuIDDepwhWk7jZC0RTdopnAYKh bandit6: DXjZPULLxYr17uwoI01bNLQbtFemEgo7 bandit7: HKBPTKQnIay4Fw76bEy8PVxKEDQRKTzs bandit8: cvX2JJa4CFALtqS87jk27qwqGhBM9plV bandit9: UsvVyFSfZZWbi6wgC7dAFyFuR6jQQUhR bandit10:truKLdjsbJ5g7yyJ2X2R0o3a5HQJFuLk bandit11:IFukwKGsFW8MOq3IRFqrxE1hxTNEbUPR bandit12:5Te8Y4drgCRfCx8ugdwuEX8KFC6k2EUu bandit13:8ZjyCRiBWFYkneahHwxCv3wb2a1ORpYL bandit14:4wcYUJFw0k0XLShlDzztnTBHiqxU3b3e bandit15:BfMYroe26WYalil77FoDi9qh59eK5xNr