Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5021d32d4e3875…

MALICIOUS

PDF

42.2 KB Created: 2021-05-12 21:57:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8e0550acbb9925603c682b97515a8ab8 SHA-1: 4c85839cde9e6d2a20f34e9660ecfb74c97a8a3a SHA-256: 9d5021d32d4e38759ba000d7033c0b2379c81655bbca71a3ddee060d13b1d2ee
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs that link to SEO-optimized PDF files, suggesting a link farm designed to drive traffic to potentially malicious content. The ML classifier also strongly indicated maliciousness. The presence of a call-to-action phrase and external URIs points towards a phishing or scam attempt, likely to distribute further malware or lead users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/woman-roblox-game-hack
    • http://iacfhouston.com/images/how-to-get-free-robux-easy_GM431946152.pdf
    • http://iacfhouston.com/images/roblox-hack-ga_GM431946152.pdf
    • http://iacfhouston.com/images/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdf
    • http://iacfhouston.com/images/www-roblox-com-free-robux_GM431946152.pdf
    • http://iacfhouston.com/images/free-spin-coin-master-game_GM406889139.pdf
    • http://iacfhouston.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://iacfhouston.com/images/free-spins-coin-master-2021-today_GM406889139.pdf
    • http://iacfhouston.com/images/toolbox-for-minecraft_GM479516143.pdf
    • http://iacfhouston.com/images/free-robux-codes-no-verification-2021_GM431946152.pdf
    • http://iacfhouston.com/images/coin-master-free-coins-link-2021_GM406889139.pdf
    • http://iacfhouston.com/images/is-minecraft-free-on-xbox_GM479516143.pdf
    • http://iacfhouston.com/images/master-coin-free-link_GM406889139.pdf
    • http://iacfhouston.com/images/free-free-robux_GM431946152.pdf
    • http://iacfhouston.com/images/get-free-spins-coin-master-2021_GM406889139.pdf
    • http://iacfhouston.com/images/free-op-minecraft-servers_GM479516143.pdf
    • http://iacfhouston.com/images/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • http://iacfhouston.com/images/coin-master-free-spins_GM406889139.pdf
    • http://iacfhouston.com/images/how-to-get-unlimited-robux-2021_GM431946152.pdf
    • http://iacfhouston.com/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdf
    • http://iacfhouston.com/images/coin-master-hack-apk-35-11_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004850.bin
bcf52a41bc99f249d3dfb646aad2692ee2470fa6ae5fb7b964d7a21da5d5dfe3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4850 25164 bytes
font_01_sfnt_off00008208.bin
92a7e3fdf75e6a3eed9122ed44239e161dce5939606c0e86a8fd8d519394caff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8208 18468 bytes

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