Malicious PDF — malware analysis report

Static analysis result for SHA-256 825e08d5318e5ff0…

MALICIOUS

PDF

37.9 KB Created: 2021-07-06 11:22:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1ab6a98fe17ea14dd02a32d32f9d39ec SHA-1: 526a25b97a1a44d93cf1ad5fdf384b8522cac141 SHA-256: 825e08d5318e5ff02bfad93416678dee29e37c2b224b7c394093c12362d0f425
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a primary focus on 'coinmasterhack-club-game-hack' and other game-related hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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.tw/app/406889139/coinmasterhack-club-game-hack
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-get-minecraft-java-free_GM479516143.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-private-jet-free_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-get-free-robux-and-not-do-a-survey_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/robux-hacks-code-admin-commands_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-robux-no-download-or-survey-2021_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/murder-mystery-hacks-roblox_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-coin-master-spins-2021_GM406889139.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/oprewards-com-earn-free-robux_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/comment-hacker-roblox-prison-life_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-70-spin-link-2021_GM406889139.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-commands-hack-download_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-tiktok-video_GM835599320.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/unlimited-spin-coin-master-hack_GM406889139.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/rewards-robux_GM431946152.pdf
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-robux-hack-us_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003234.bin
8cab10f827be8c17ced1a02508d3b9552b9bbb6b7b8111816aec3a1b8f53c94f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3234 23124 bytes
font_01_sfnt_off0000663c.bin
c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663C 2896 bytes
font_02_sfnt_off00007021.bin
00ba98d5e77721c9e524ff0a63be7b74d2880e6b955548df8efbf20b888d56ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7021 18804 bytes

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