Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bfdf1ccdfea58b…

MALICIOUS

PDF

43.2 KB Created: 2021-05-16 23:25:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4d9df972fa5f7264b44c4be0949f985d SHA-1: d140e55736663723e5e88db587753683ca7fbd1f SHA-256: b5bfdf1ccdfea58b741af3f7df857a1bee9db8db373439fdbde2eedec8bb7bbb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files that are likely malicious, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://netcdn.xyz/app/431946152/rbxdemon-game-hack', suggests a lure related to game hacks. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/rbxdemon-game-hack
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/free-rare-cards-for-coin-master_GM406889139.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/coin-master-hack-free-spins_GM406889139.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/robux-hack-generator_GM431946152.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/how-to-hack-in-arsenal_GM431946152.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/free-robux-now_GM431946152.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/how-to-minecraft-for-free_GM479516143.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/free-robux-com-no-verification_GM431946152.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/roblox-free-hair-codes_GM431946152.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/free-robux-obby_GM431946152.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/free-coin-master-spins-no-human-verification_GM406889139.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/coin-master-tricks-and-hacks_GM406889139.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/give-me-robux_GM431946152.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/minecraft-free-download-unblocked_GM479516143.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/coin-master-download-hack-ios_GM406889139.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/how-to-hack-coin-master-game_GM406889139.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/hacks-for-roblox-jailbreak_GM431946152.pdf
    • http://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a98.bin
2070af9e4da5db45de0f03c3bcdcaf8f0274f5a2e1557cecdfdaf2c8890fb827		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A98 25716 bytes
font_01_sfnt_off000086c2.bin
84e994ea3e0766e4b6b44f1efc08852f1b1b6721f581ba32b946cb803bfb180d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C2 18144 bytes

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