Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65b93e4c074ff90…

MALICIOUS

PDF

35.0 KB Created: 2021-06-19 09:18:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9217ade57eeefe7c147bfea702818dcd SHA-1: ae53f9ffbde18c0e170249d079f79ebaeb09bee8 SHA-256: b65b93e4c074ff907d793079782ad5b217a8e0ec7cdf076d7bb3ec48420c1177
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to external resources disguised as game hacks or cheats. The primary malicious URL, http://netcdn.co/app/406889139/coin-master-fan-page-facebook-game-hack, suggests a download lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flags this PDF as malicious.

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 http://netcdn.co/app/406889139/coin-master-fan-page-facebook-game-hack
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-spins-no-verification_GM406889139.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/blox-pink-robux-free_GM431946152.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-jeans_GM431946152.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-game-free-download-for-pc_GM406889139.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-wings_GM431946152.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-pe-hacks-ios_GM479516143.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-free-robux_GM431946152.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coins-coin-master-daily_GM406889139.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-download-mac_GM479516143.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/get-free-robux-without-human-verification_GM431946152.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-do-i-get-free-robux_GM431946152.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coins--spins-coin-master_GM406889139.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/promo-codes-for-free-stuff-roblox-2021_GM431946152.pdf
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000329c.bin
89736b2da7de5a385942ab96921350f3e4d293cdf839f3e2d2266db7c1575f66		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329C 22804 bytes
font_01_sfnt_off000065c2.bin
c41ef087e97e4ddba89d6c7aa526d87d7844b370b1276ac9bee0370a506b134e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C2 18480 bytes

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