Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ffaee58c739ba2…

MALICIOUS

PDF

40.0 KB Created: 2021-05-24 05:40:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0e93687e53519d9d279ca9580b198d60 SHA-1: 5106ad24f3480f6dd87c6b01a9a7d82bc15d6395 SHA-256: 42ffaee58c739ba20e06d0fbbe5e8f4b4da5a85a41b2949d0e96d82b51056d2d
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA, a common lure to trick users into executing further malicious actions. It contains multiple embedded URLs, with one pointing to a resource related to 'how to hack people on Roblox', suggesting a social engineering pretext. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

Heuristics 4

  • 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
  • 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 https://netcdn.xyz/app/431946152/how-to-hack-people-on-roblox-game-hack
    • http://alcomet.ru/images/level-coin_GM406889139.pdf
    • http://alcomet.ru/images/free-robux-no-verify-2021_GM431946152.pdf
    • http://alcomet.ru/images/roblox-promo-codes-free-robux_GM431946152.pdf
    • http://alcomet.ru/images/roblox-exploit-download_GM431946152.pdf
    • http://alcomet.ru/images/hack-coin-master-for-iphone_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000034af.bin
9ca27b0007c2a5fb7c8427c40b9b22ce593dc34804e2eb77d13ca691c7e806f8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34AF 30928 bytes
font_01_sfnt_off000079ff.bin
9439cdf519c477105af26a237b903c28353edd649090bb99f856962d56c9ecd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FF 18676 bytes

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