Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d9cf6f88206508…

MALICIOUS

PDF

35.6 KB Created: 2021-07-06 09:19:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 171fd69bb30c8b55ac995d1b4eab1126 SHA-1: 5853914094f3cc920e258532e4dc5e8fcfc61a36 SHA-256: 65d9cf6f88206508a699b2a3b5f8e51a135f2858c228470defd70fe906400725
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-robux-hack-2021-game-hack. The document body and heuristics indicate a lure for "free Robux" or game hacks, a common social engineering tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/free-robux-hack-2021-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-accounts-crack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/can-you-make-a-roblox-game-for-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robux-hack-free-no-human-verification-or-survery_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-download-app-verification-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-epic-minigames-speed-hack-download-free-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-the-hood-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-lost-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-commends-on-roblox-innovation_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-pin-generator_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/my/tasksIn 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
font_00_sfnt_off000031ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31CA 23228 bytes
SHA-256: d91b10bef940e3765d34f1d8b695dc401466cfa9e697a72721f7926de7002db9
font_01_sfnt_off00006595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6595 19288 bytes
SHA-256: f0e75447e64b5aff6e0a409bd439ae7070421d1013f4950abf0614a44f9f6dfe

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