Malicious PDF — malware analysis report

Static analysis result for SHA-256 4781b509ffae162e…

MALICIOUS

PDF

47.0 KB Created: 2021-06-11 01:06:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-20
MD5: e1983d1d00c54afecc4b01d4c68d2545 SHA-1: 51458211e04fd20bc3204803d5ef1226ed5eaa7f SHA-256: 4781b509ffae162e40c2a8c382486798ec1b552213abc67b941352e7b1d2eb58
200 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/great-robux-hack-game-hack In PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/offers-for-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-hack-unlimited-robux_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
font_00_sfnt_off00004d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D13 25212 bytes
SHA-256: bbb57153e8fe6e2ca415bcc9f9ada4a27d88ccde89c4e9c0d3ce52c6a29e8ec8
font_01_sfnt_off0000873c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x873C 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off00009463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9463 18352 bytes
SHA-256: 4549188655d3cb252195fb119574b4f40c9b133458d94e3b35764f1be3fa1300