Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e89c81e6a71704…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 00:58:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2f65df86ef6578c5ccebf268935f61e3 SHA-1: 00f0954608278e4ffba67d898ecf26a018422545 SHA-256: f9e89c81e6a71704d9722018792b6e357a86a8c56aa11ae877a785339de0e696
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs that redirect to websites offering game hacks and free in-game currency, such as Robux. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the links and the lure suggest a phishing or scam attempt designed to drive traffic to malicious sites.

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/431946152/www-roblox-com-free-robux-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/cheat-sur-tout-les-jeux-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-fashion-frenzy-free-online-game_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/speed-hack-in-any-roblox-game-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/hack-roblox-simulador-de-levantamiento-de-pesas-3_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-place-visits_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-obc-and-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hack-mod-apk-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-the-livind-dead-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x320D 21852 bytes
SHA-256: d5b0170350c29918a9e65f97d4eabe047f89d140de6b2e87b09ad32afe2f2b85
font_01_sfnt_off0000627b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627B 19412 bytes
SHA-256: 9f2d18035413ba33397c677b2581e7e69ab306c490ad5b1efc57e4a607bb5205

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