Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4bc1897512af33…

MALICIOUS

PDF

45.0 KB Created: 2021-06-08 17:32:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 17e5713aa272c5d4336906b8d9b18f4d SHA-1: e6e3b23aee17fdb595d67a5971797aae2d57df95 SHA-256: 0d4bc1897512af33c3e0dbeaa21637eef7d789cab746f513f964bb349928cdd2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The document displays a fake CAPTCHA lure to trick users into clicking an embedded URL, which likely leads to the download of a second-stage payload. The ML classifier strongly indicated maliciousness, and the presence of multiple suspicious URLs reinforces this assessment. No scripts were extracted, but the document's structure and heuristics suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/5.11-hack-roblox-game-hack
    • http://m-sv.net/images/install-coin-master_GM406889139.pdf
    • http://m-sv.net/images/free-800-robux_GM431946152.pdf
    • http://m-sv.net/images/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://m-sv.net/images/coin-master-2021-free-spins-link_GM406889139.pdf
    • http://m-sv.net/images/robloxmatchcom-free-robux_GM431946152.pdf
    • http://m-sv.net/images/free-games-like-coin-master_GM406889139.pdf
    • http://m-sv.net/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • http://m-sv.net/images/minecraft-pe-hack-client_GM479516143.pdf
    • http://m-sv.net/images/free-spin-coin-master-link-today_GM406889139.pdf
    • http://m-sv.net/images/coin-master-free-coins-link_GM406889139.pdf
    • http://m-sv.net/images/free-spins-on-coin-master_GM406889139.pdf
    • http://m-sv.net/images/how-do-u-hack-roblox_GM431946152.pdf
    • http://m-sv.net/images/roblox-got-talent-piano-hack_GM431946152.pdf
    • http://m-sv.net/images/free-robux-no-verification-required_GM431946152.pdf
    • http://m-sv.net/images/minecraft-hacker-skin_GM479516143.pdf
    • http://m-sv.net/images/free-robux-earn_GM431946152.pdf
    • http://m-sv.net/images/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://m-sv.net/images/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://m-sv.net/images/free-minecraft-account-reddit_GM479516143.pdf
    • http://m-sv.net/images/free-coin-master-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005091.bin
ee361d7b0474eab4325522b134dd6b24ac9cd36c6e4307b017ffcad86792584b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5091 26152 bytes
font_01_sfnt_off00008c71.bin
38004b8d86b8a4c1124e5e7556acced72b88dc279f755a8f3fe29e01457445e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C71 18488 bytes

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