Malicious PDF — malware analysis report

Static analysis result for SHA-256 4254b6ef7585d878…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 19:51:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-15
MD5: c576cfd3cbabde11e13df63aafa454bb SHA-1: 331d447df3e58ab465fad5c4d248a250dcadfa41 SHA-256: 4254b6ef7585d8784752bb9531d2369ca96f060cf1d94f11be14b60d97ddc1b3
160 Risk Score

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/www-free-robux-com-game-hack In PDF document text
    • https://library.iuli.ac.id/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-vip-hack_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-hack-no-survey-no-download-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-fast-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/is-it-ilegal-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-hack-roblox-game-servers_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-no-human-verification-or-survey-or-email_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-roblox-stuff-2021-promo-codes_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/is-there-a-free-way-to-change-roblox-name_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-hack-fairytaill-forgoten-legend-roblox_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-hack-into-builders-club-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-roblox-adder_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-hack-winrar_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/huskybuxcom-free-robux_GM431946152.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_off00002ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE5 22580 bytes
SHA-256: 4c0d1563d5c850707172672ad80dbb7a6614fd725d065063eb0005b97a48cddd
font_01_sfnt_off00005edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDC 19336 bytes
SHA-256: a173ff8a3a1fb1a8f757a1ab0f7adc35a375ad8a6d6bf5003b7cfea3ec8bf678

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