Malicious PDF — malware analysis report

Static analysis result for SHA-256 941c777a763be452…

MALICIOUS

PDF

51.1 KB Created: 2021-05-13 16:00:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-12
MD5: 40216fef454f5dddbf76ae0a7f79a6bb SHA-1: c4ed7d58b4d2baf3328a80c1d70b5aebcdb09774 SHA-256: 941c777a763be452db7ccc9e7a44c8bb3e6a25f249bb9e0ea971e51868e53a3d
160 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9300

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 https://netcdn.xyz/app/431946152/free-roblox-hack-game-hack In PDF document text
    • http://taskcyg.nl/images/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://taskcyg.nl/images/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://taskcyg.nl/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://taskcyg.nl/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/oginject-co_GM406889139.pdfIn PDF document text
    • http://taskcyg.nl/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://taskcyg.nl/images/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://taskcyg.nl/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/rewards-robux_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://taskcyg.nl/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://taskcyg.nl/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://taskcyg.nl/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://taskcyg.nl/images/free-robux-cards_GM431946152.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_003_off00004d18.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D18 26280 bytes
SHA-256: 2633e427e9db6be30548abf12d92ebaa82ff3ede4e4c36a109e0a9368cbba177
font_01_sfnt_off00008aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA5 8448 bytes
SHA-256: cbac2cbe16e6b241ec9b9cf3964449bd05cb69971bed5d7950f63902afa414d6
font_02_sfnt_off0000a5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B1 18344 bytes
SHA-256: 9d921b2eee93f33e2efc5c53c848117e08d630d06cf868d7193b51dd4894dd93

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