Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4159ea437da361…

MALICIOUS

PDF

35.5 KB Created: 2021-06-27 23:37:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 88dfb16ce1d274001fa9d9542fe62509 SHA-1: dde42beb15a79cf18da7aeed4e475e39aa9ca5fc SHA-256: ec4159ea437da361d0a1dd18ccaab77ad2583056ed3261c76663aca5572af216
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.co/app/431946152/can-i-get-banned-from-a-roblox-game-for-cheating-game-hack PDF link annotation
    • http://library.imz.or.id/repository/how-to-get-free-robux-easy-december-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-free-gui_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-do-u-use-cheat-engine-with-roblox_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-get-free-hat-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/hack-roblox-mod-menu_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/hack-roblox-money-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-candy-van-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/comment-hacker-sur-roblox-admin_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/microsoft-rewards-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_off0000316d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316D 22888 bytes
SHA-256: e98b3d5f46d6fca2de6c7418af4ddd72bd12952ab2bb8250de4afe8608089f0d
font_01_sfnt_off000064b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B2 19472 bytes
SHA-256: 408dbd7a6cf19439e272b4f8ba36608832cae2be052d44155706d2a442de087f

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