Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f74eba764ebe7e…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 12:04:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9aa2da185902f577478085bf2535ad58 SHA-1: d4c1a2acf8242b13bdb8efbaac6f96fa2c43df04 SHA-256: 59f74eba764ebe7e15500aa99a598aee853d5689d0906c941c667ed85e7e680c
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/431946152/give-me-free-robux-game-hack PDF link annotation
    • http://lib.unar.ac.id//repository/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-free-robux-2021-website_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/roblox-retail-tycoon-money-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/generator-robux_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
font_00_sfnt_off0000320e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x320E 22040 bytes
SHA-256: 6c9dd58f3a2bb083f33df7891c8be4699e76e5dfe377205df8afebe2aecca450
font_01_sfnt_off000062f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F4 19144 bytes
SHA-256: 49caa2a42633a23caf301bb0fa3c0edf25e4e3c2cd040ebd05f96fd152ca8770

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