Malicious PDF — malware analysis report

Static analysis result for SHA-256 743f4f893cc708cf…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 22:28:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3acf7d2452fedfa754aeaab93ea63eb9 SHA-1: f513846336593aba831c0ed1c03561f267d476b4 SHA-256: 743f4f893cc708cf193c776571ff073609b7e1c80e634e013654b5b48dd646fc
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/479516143/minecraft-realms-free-game-hack PDF link annotation
    • http://lib.icbc-indonesia.org//repository/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-any-game-ban-script-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-shirts-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-save-art-on-free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-generator-with-color-verification_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hack-into-anyones-roblox-account-to-steal-their-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/comment-hack-sur-roblox-struid_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/tiktok-free-generator_GM835599320.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-cheat-dll_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-face-err-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/prison-royale-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-generation-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-hack-v30rar_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/robux-xyz_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_off0000325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x325C 22692 bytes
SHA-256: 09f683b6b99c179b03ee0f2f024aa183516d4f682fe7e2dddbf7b42f0023d697
font_01_sfnt_off00006413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 18192 bytes
SHA-256: 438e855f910e59847acc8a78596dc4b7436319684ace8ad54ecdb917bc5ff755

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