Malicious PDF — malware analysis report

Static analysis result for SHA-256 191d2245e3f3cbb2…

MALICIOUS

PDF

49.0 KB Created: 2021-06-08 21:18:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-22
MD5: 63eb70aee7a40218863730b8010b2e1c SHA-1: 941ef6111ca34872298fe5867af26334fdcd9b00 SHA-256: 191d2245e3f3cbb2ac787f7f123be0f5e9812bed409548e28fe9a88084fb61f0
220 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/shooting-roblox-free-too-play-on-line-game-hack In PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-get-free-tiktok_GM835599320.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/oprewards-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-minecraft-capes-no-mods_GM479516143.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_004_off0000510f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x510F 32864 bytes
SHA-256: 075f089ce09594567c3876fe0b6a4c27021a9673d764436ff29412ce17bdc190
font_01_sfnt_off00009ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE8 19188 bytes
SHA-256: 117f23ed912e0d826e38a687499e1c48da89291372e567c38aa916fefd64f77c

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