Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9b8ba002baa685…

MALICIOUS

PDF

42.4 KB Created: 2021-05-16 02:03:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c74f5861238f48d2649fe82ca9628fbf SHA-1: 2ead248557bf8b4c24b5939684f6a95986220ddd SHA-256: 0a9b8ba002baa68579bdf34534462130f0e4cabb09ddf8e4087ffb7fd7b49078
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick users into interacting with it. It also embeds multiple URLs, including one pointing to 'netcdn.xyz', which likely serves as a download or redirection point for a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/free-robux-roblox-promo-codes-game-hack
    • http://artindex.pro/images/free-robux-youtube_GM431946152.pdf
    • http://artindex.pro/images/free-spin-link-in-coin-master-game_GM406889139.pdf
    • http://artindex.pro/images/coin-master-gift-link_GM406889139.pdf
    • http://artindex.pro/images/minecraft-ps3-free-download_GM479516143.pdf
    • http://artindex.pro/images/coinmasterfreespins_GM406889139.pdf
    • http://artindex.pro/images/how-to-get-free-pet-food-in-coin-master_GM406889139.pdf
    • http://artindex.pro/images/coin-master-spins-hack-2021_GM406889139.pdf
    • http://artindex.pro/images/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://artindex.pro/images/free-robux-now_GM431946152.pdf
    • http://artindex.pro/images/coin-master-free-spins-facebook_GM406889139.pdf
    • http://artindex.pro/images/how-to-hack-coin-master_GM406889139.pdf
    • http://artindex.pro/images/free-spin-coin-master-online_GM406889139.pdf
    • http://artindex.pro/images/free-minecraft-account-and-password_GM479516143.pdf
    • http://artindex.pro/images/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdf
    • http://artindex.pro/images/roblox-studio-free-download_GM431946152.pdf
    • http://artindex.pro/images/roblox-hack-com_GM431946152.pdf
    • http://artindex.pro/images/coin-master-links-for-free-spins-2021_GM406889139.pdf
    • http://artindex.pro/images/legit-free-spins-coin-master_GM406889139.pdf
    • http://artindex.pro/images/hack-the-coin-master_GM406889139.pdf
    • http://artindex.pro/images/roblox-games-with-free-vip-servers_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004822.bin
d453a77c81442026e0b7879ac45a80fb8a5b56fb2359ec1d2a0384cf7a0afc1d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4822 25048 bytes
font_01_sfnt_off0000826c.bin
9297a3cb5fba7ca587652f513aa1222127deb04773b45a9c0f6482a9c793d56f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x826C 18676 bytes

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