Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afd81b1e418904a…

MALICIOUS

PDF

36.0 KB Created: 2021-07-05 23:05:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-06
MD5: 817eab360b993db053ee0aace06669fd SHA-1: 6b8b72810670fa7e2659ebc6cf34a2116387d7c2 SHA-256: 4afd81b1e418904a2ad4f6d29bafb3ac9dccd53071fddb48b3c124c00fc66691
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/406889139/coin-master-hack-mod-apk-2021-game-hack In PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-dayz-cheat-engine_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-roblox-exploits-like-synapse_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-2-000-robux-for-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-no-human-verification-2021_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
stream_002_off000033c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33C4 23344 bytes
SHA-256: 195e1b2a6318dfcf5af3f8605a355c011c66b358d0d211fea3f13a01b8d69a83
font_01_sfnt_off00006878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6878 18756 bytes
SHA-256: a597e2a1a6313d69caaefc0fd9e6b3b52d3816ecea07cbaeac835cf7e101dd2a

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