Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd11842a18e11e24…

MALICIOUS

PDF

33.2 KB Created: 2021-07-20 06:26:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: eb3a281dfc9fa980cef9b3884bcc593e SHA-1: 0966bcd84f48324da2c6c08024b7c837c3a50cb8 SHA-256: cd11842a18e11e24444df8fa777fe49efc3ca26191865afd2f0911d08f662334
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document displays a fake CAPTCHA and a "CLICK HERE TO ACCESS MINECRAFT GENERATOR" call-to-action, designed to lure the user into clicking embedded malicious links. These links, such as http://netcdn.tw/app/479516143/how-do-you-get-minecraft-for-free-game-hack and others pointing to raw IP addresses, likely lead to the download of a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/479516143/how-do-you-get-minecraft-for-free-game-hack
    • http://110.78.114.242/ckfinder/userfiles/files/free-tiktok-followers-instantly_GM835599320.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/minecraft-free-android_GM479516143.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/free-robux-no-offers_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-earn-free-robux_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/free-robux_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/can-u-get-free-robux_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/minecraft-education-edition-free_GM479516143.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/free-minecraft-codes_GM479516143.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c79.bin
62e4bfebf6c0ec08a95acee3b60cd6b8ba7b2ebfb872463824531378ce264bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C79 22984 bytes
font_01_sfnt_off00005fd6.bin
67167d5a85b4e79e1ce06ee0ca4bd8624b04b02f24f28de3bf15fdadfc91d29a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD6 18344 bytes

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