Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32786715ba15a2a…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 13:56:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 973a464995ba69b206032f0510818265 SHA-1: 5dff9a73522dcf730214a9e1c6d3d696af4feced SHA-256: b32786715ba15a2a9ee9b8dfef4085c255eb7e8fa5708680c80b25b7bc5a0e35
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into interacting with it, likely to initiate a download or redirect to a malicious site. The embedded URLs and document body content strongly suggest a lure for obtaining in-game currency or hacks, which is a common social engineering tactic. No scripts were extracted, but the presence of external URIs and the fake CAPTCHA heuristic indicate a malicious intent to redirect the user to potentially harmful content.

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/free-robux-generator-easy-verification-game-hack
    • http://cosver.eu/images/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://cosver.eu/images/how-to-get-free-robux-easy_GM431946152.pdf
    • http://cosver.eu/images/robux-hack-2021_GM431946152.pdf
    • http://cosver.eu/images/free-roblox-gift-card_GM431946152.pdf
    • http://cosver.eu/images/working-coin-master-hack_GM406889139.pdf
    • http://cosver.eu/images/how-can-i-get-free-robux_GM431946152.pdf
    • http://cosver.eu/images/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://cosver.eu/images/free-minecraft-skins-xbox-one_GM479516143.pdf
    • http://cosver.eu/images/coin-master-game-hacks_GM406889139.pdf
    • http://cosver.eu/images/blox-fish-free-robux_GM431946152.pdf
    • http://cosver.eu/images/coin-master-download-hack-ios_GM406889139.pdf
    • http://cosver.eu/images/coin-master-free-spin-generator-without-human-verification_GM406889139.pdf
    • http://cosver.eu/images/how-to-hack-roblox-tycoons-2021_GM431946152.pdf
    • http://cosver.eu/images/robux-generator_GM431946152.pdf
    • http://cosver.eu/images/roblox-get-free-robux-card-codes_GM431946152.pdf
    • http://cosver.eu/images/minecraft-hack-client-18-9_GM479516143.pdf
    • http://cosver.eu/images/real-minecraft-for-free_GM479516143.pdf
    • http://cosver.eu/images/free-coins-coin-master-link_GM406889139.pdf
    • http://cosver.eu/images/minecraft-free-download-unblocked_GM479516143.pdf
    • http://cosver.eu/images/coin-master-vip-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cd4.bin
4da98a3981b8e81ed49acd4cbdaaf44d08536b47f0ec4d7c5cdd9a2ee6a9d5e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD4 27084 bytes
font_01_sfnt_off00008994.bin
7bcb3655e15c6bfff33dfa38c69023639e6d75a7827d1ed6f37ad83113c5b070		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8994 18780 bytes

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