Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf84ed79b6244d08…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 05:42:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0863133d0aecd6fcc7e83105e6233d08 SHA-1: 8ea4a5c67cadfa3ac62c0653b2da850747bd7e02 SHA-256: cf84ed79b6244d083b66d44aed33cfdce08e6c70f99bbb392809fa0aa700d57d
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/free-minecraft-pe-server-game-hack PDF link annotation
    • http://library.forda-mof.org/katalog/repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/getrobux-come_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-use-roblox-cheats-on-xbox-one_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/wurst-115-2_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/to-get-free-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_off000031ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31FF 22932 bytes
SHA-256: 054e8a9e694a277fcff035e936cb734108612f2fe44dc37eab39cd81d31ba565
font_01_sfnt_off0000655d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655D 18124 bytes
SHA-256: 44cbab3028a3df9bc9841a4d80e53babf0d09cfa62fa83b1fc03cf8d1ca0a26e

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