This email tries to make the recipients download and open the attached file that purportedly contains the e-ticket, but is actually a piece of malware that - according to the AV solutions that detect it - is either ransomware or a backdoor Trojan.
Either way, the file is bad news - especially for those Windows users that still don't have an active AV solution on their machines.
Fake e-tickets from popular airlines are one of malware peddlers' preferred methods of tricking people into downloading malicious attachments, so you should always carefully assess the legitimacy of such emails.
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