Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd586469b63346a…

MALICIOUS

PDF

44.5 KB Created: 2021-05-17 15:23:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 00a9f85d662b8a079b64e5e949c2cb8c SHA-1: 492d6ccfb38965d85eb83bf2afea273140b7102b SHA-256: 9dd586469b63346ada1e26c29d53bea4d86e3c4a4129872c94934ce2c3eae4bc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a PDF link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a call-to-action phrase suggests a lure to download content, likely malicious applications or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/archery-master-3d-apk-and-mod-free-download-unlimited-coins-game-hack
    • http://collectionsuncovered.com/media/storage/editor/files/free-pe_GM479516143.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/collect-free-spins-coin-master_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/watch-ads-for-robux_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/promo-codes-for-free-robux_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/who-to-get-free-robux_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-money-links-coin-master_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/but-link-says-free-robux_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-coin-master-coins-and-spins_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-and-coins-haktuts_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-minecraft-java-server_GM479516143.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-whatsapp-link_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-hack-apk-2021-ios_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-blogspot_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-codes-not-used_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-zone-free-robux_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/robloxfun-com-robux_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-coin-master-generator_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e83.bin
b6ea491cf47269139b2854d75fb6dea68c27c721afbf35afffd8dcfc9f3b69a6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E83 25300 bytes
font_01_sfnt_off000087db.bin
1f4db19c4ad26965eb53476f7a038d439f2d42a62f857c7cf6da591de7fc7d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87DB 19600 bytes

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