Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ff4d3944cd41e4…

MALICIOUS

PDF

38.6 KB Created: 2021-05-10 16:01:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ef42869383a5dd66574171b92c6d8e08 SHA-1: 31c4b4f140d6e8033124184059a52d9cc0c7abaa SHA-256: 97ff4d3944cd41e4752e39665c414c79dd64071cd9e7beb19b72a646df38237a
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking embedded links. The primary link directs to a "free generator / game hack" site, which is a known malicious redirector. The document also contains numerous other links to potentially malicious PDF files hosted on the `mohacad.hu` domain, suggesting a multi-stage download or redirection scheme. No scripts were extracted, but the document's structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-and-coins-coin-master-game-hack In PDF document text
    • http://mohacad.hu/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/getrobux-come_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-arsenal-hacks_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003d32.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D32 25164 bytes
SHA-256: a98e7040debcc30bc99fe6d1e18a3222ddad52bb90c213a5d63c8f201e6c0324
font_01_sfnt_off0000756c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x756C 18060 bytes
SHA-256: d4954d2d00bde9f6a1061857a61d2c62c1ae360f44744af150ee923481526d51

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