Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34cbd4b11d87549…

MALICIOUS

PDF

35.2 KB Created: 2021-05-21 17:19:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 03bd1028ada674dda0034ac2e8e851f2 SHA-1: 26030071266457973eae58daf0b9fadac6468a22 SHA-256: a34cbd4b11d875496675ef68064fb7230b75527c925817abd190c975f4822784
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into interacting with malicious content. It also embeds multiple URLs, one of which is directly linked to a fake CAPTCHA heuristic, suggesting an attempt to redirect the user to a malicious site or download a payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/406889139/free-spins-on-coin-master-game-game-hack
    • http://asiashop-france.fr/images/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • http://asiashop-france.fr/images/promo-codes-to-get-free-robux_GM431946152.pdf
    • http://asiashop-france.fr/images/hacks-master-coin_GM406889139.pdf
    • http://asiashop-france.fr/images/coin-master-daily-free-spins_GM406889139.pdf
    • http://asiashop-france.fr/images/50-free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032b0.bin
f242ddd4bf7feaccfb4851a822d4b65839c387a79dbe90397188e085dae0df4b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32B0 23908 bytes
font_01_sfnt_off000068d0.bin
b1f30c98449655e0c119849c00bf29bb9bd656252beb56b2567f3adea4b6d957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D0 18148 bytes

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