Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf6b6283c25d22f…

MALICIOUS

PDF

39.2 KB Created: 2021-05-25 08:15:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 469dc55522dd26a4aea72a8a4c16eb1e SHA-1: 30ac6fe1efcdd760ddd4951d2a05c4046258c581 SHA-256: 7cf6b6283c25d22f53342f3b120c9e66ddcbf10b678ffe57bcfb9c8b17828b54
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document presents a fake CAPTCHA and a lure for "free TikTok coins" to trick users into clicking malicious links. The embedded URLs point to sites offering game hacks and generators, which are common pretexts for phishing or malware delivery. While no scripts were directly extracted, the ML classifier and fake CAPTCHA heuristic strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/835599320/free-tiktok-coins-game-hack PDF link annotation
    • http://www.makoto.su/images/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://www.makoto.su/images/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003256.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3256 26316 bytes
SHA-256: 052eb1527176ed0608ad3a9de23c910cd82c3474efc270fdaf879fc68f33d3a9
font_01_sfnt_off00006ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED2 3236 bytes
SHA-256: 16b1c50426147a35a723b6b1bbd26dbda0843d611793345b4aca2debcbfa6001
font_02_sfnt_off00007a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A09 17456 bytes
SHA-256: af63c3f67091ff5b4163c7a95634870b81efad78e40c2266e63b82bf422718e0

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