Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f8dc0af562103d…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 13:35:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-07-01
MD5: cf6d596f0c8e99b25c9464369fe05131 SHA-1: 33d37d084cae30810e72cd29c4582d8f761ec88a SHA-256: a4f8dc0af562103dffe58192961525bc450bb430b25361f112e308cc0a67ef1c
160 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/free-spins-and-coins-on-coin-master-game-hack In PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/demon-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn extracted file (stream_003_off0000489c.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000489c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x489C 24944 bytes
SHA-256: 368257d96dd7f4f9cc97db0302eeb1aee60bb37250832c59f6d5b3c085257f52
font_01_sfnt_off00008252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8252 18060 bytes
SHA-256: 64690fddacb88a1b87eb78a3bf181b542b813998c8d2539429c7660090ba79fa