Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3ac7d90da29367…

MALICIOUS

PDF

35.0 KB Created: 2021-06-20 06:45:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fdff4381f62a60d8a809ffdb0ee77e72 SHA-1: bf4d23a5e8e70f00868740b4ad48911d78a9e0af SHA-256: 3f3ac7d90da29367eb26a067c3b836dd7b0c14f20aeb4f219feb6feb94bbc359
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to redirectors and pages offering game hacks and free items, a common lure for malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of known malicious redirector infrastructure. While no scripts were explicitly extracted, the nature of the lures and the ML classification suggest a high likelihood of the document attempting to download and execute a secondary payload or redirect the user to a phishing site.

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.co/app/431946152/free-stacked-roblox-arsenal-account-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-items-obby_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-pastedin_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-copy-remote-functions-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/hacks-para-roblox-booga-booga-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/earn-rbx_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/paginas-web-para-conseguir-robux-gratis-sin-hacks-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-rewards_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-daily-free-spins-link_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
font_00_sfnt_off0000320a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x320A 22176 bytes
SHA-256: a07a6295b71ec56d13633e0f6c702f87688fcc62eb0b97f525a8bec701851b27
font_01_sfnt_off00006347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6347 19240 bytes
SHA-256: 361ec804582a18f64795d0cf9e73409b15bd6733680958d059e7772ff99e2865

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