Malicious PDF — malware analysis report

Static analysis result for SHA-256 4342b2fab3e2481f…

MALICIOUS

PDF

42.2 KB Created: 2021-05-14 10:23:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cb6fbbf2a97ba0becc66ebce3444df61 SHA-1: d3ec45c9c53027ba26df8736bd641aa5b35c2583 SHA-256: 4342b2fab3e2481fddb4e76e5f27765dd2767afad753068086ed4f1109e50632
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 0.9971

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 https://netcdn.xyz/app/406889139/free-cheat-codes-for-coin-master-game-hack PDF link annotation
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/mcpe-com_GM479516143.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-hack-no-verify_GM406889139.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
stream_003_off00004b82.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B82 24324 bytes
SHA-256: 5ed0662756de199ea2aae8e578e98731599f63ca3be9c2825dcd2e590cce1ad5
font_01_sfnt_off00008349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8349 18052 bytes
SHA-256: 9f7c336b46bb1f5c4c699c2d489464edf46c0e280b3a3f852c1bdf3bee9ca033

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