Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76861f4ddca1032…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 10:39:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f362e5b962026b5278dc462fa2df8c55 SHA-1: 4fd7c5ae664fcfcd4bce0c0659c9aa722b1ff897 SHA-256: f76861f4ddca1032ac4a103553058e65ae19ff57df7f54baec7ca4efc80d239b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a primary redirector URL associated with game hacks and free spins, and a large number of links to other PDF files hosted on a university repository, likely part of an SEO link farm. The document body and heuristics indicate a lure for users seeking cheats or in-game currency, which is a common social engineering tactic. No scripts were extracted, but the extensive link farm and redirector suggest a malicious workflow designed to lead users to potentially harmful content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-heaven-free-spins-today-game-hack In PDF document text
    • http://library.fisip.upnvj.ac.id/repository/lua-executor-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/https-webroblox-hack-groups-groupaspx-gid-2021239_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-pilot-helmet-roblox_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/top-10-best-free-tshirts-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/what-game-on-roblox-gives-you-robux-without-hacking_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/pokemon-go-free-shop_GM1094591345.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.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_off000031bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31BB 23228 bytes
SHA-256: 295ac7226157109312962d01eb61106e6aaf1aaf7909858d455d9b642dc7fb67
font_01_sfnt_off00006612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6612 18640 bytes
SHA-256: 3d9153b17c01349321dbf9895197e00a389ef43fe3f4ac06fe2a253dcac379fc

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