Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28ea99a3c370a30…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 23:15:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a8207ca9cfdc47e28ddcbf1bda52cce3 SHA-1: a7256d8c32ededac3386c48fc34413053df1ccce SHA-256: a28ea99a3c370a3067da849ab6b367f3eeb76da4f78a7ecb9440d6f6f289b702
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/50-000-free-spins-coin-master-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-ultimate-driving-trucker-money-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/gun-simulator-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-work-at-a-pizza-place-money-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-group-funds-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-and-any-item-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/rc7-free-download-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-executor-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-name-change-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/everythings-free-roblox-mm2-uncopylocked_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_off000031c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31C9 22856 bytes
SHA-256: bbcb5eecc7fc4b05f1f9f44e2885f5ed1f16f67c202c2e1064c15673fb8a2463
font_01_sfnt_off00006537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6537 18480 bytes
SHA-256: f050a5cb8527be99d3c3e84738d571a41e36df8bd1ad63ca537930e630161d23

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