Malicious PDF — malware analysis report

Static analysis result for SHA-256 af217dbbbccc47d3…

MALICIOUS

PDF

49.3 KB Created: 2021-06-09 07:40:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-21
MD5: 42ee7d829baa4326550ab875967521c4 SHA-1: ae734030a033e61f397b15759d0dd3db84aaff98 SHA-256: af217dbbbccc47d3dc2dd7602c48953ade7fc7e3dc3702bd16b30edd86953217
200 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/roblox-hack-nopde-engine-game-hack.
  • 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.tw/app/431946152/roblox-hack-nopde-engine-game-hack In PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/tiktok-free-fans-video_GM835599320.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/free-robux-real_GM431946152.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://nsktu.ac.in/ckfinder/userfiles/files/free-coin-master-generator_GM406889139.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_004_off000053cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53CC 26424 bytes
SHA-256: 8ceba4b0a4c0116f65ff3d4e16fe0870dab494496e8d04649ca8aa7ed86e330c
font_01_sfnt_off00009235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9235 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE6 18940 bytes
SHA-256: 1b0ef6622d90821b0f200ab1ad64b246b34529b6790914c24171f46e3c762da2

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