Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e167da9740bdbe0…

MALICIOUS

PDF

41.8 KB Created: 2021-05-15 05:08:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 81d4b429aac2150c58a0c63e33be3852 SHA-1: aeca5970366d052bccc95da7cb8236bd807a64d0 SHA-256: 4e167da9740bdbe0c37baf2dae6c075e7d45f5cbe916d7d5aacc8b68b88628b3
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, designed to trick users into interacting with it. It also embeds an external URI pointing to a URL that appears to be related to game hacks or cheats. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to deliver a second-stage payload.

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/406889139/coin-master-free-spins-for-today-game-hack
    • http://svp-steinmaur.ch/images/free-roblox-injector_GM431946152.pdf
    • http://svp-steinmaur.ch/images/how-do-you-earn-robux_GM431946152.pdf
    • http://svp-steinmaur.ch/images/robux-generator-no-verification-needed_GM431946152.pdf
    • http://svp-steinmaur.ch/images/robux-hack-tools_GM431946152.pdf
    • http://svp-steinmaur.ch/images/coin-master-free-blogspot_GM406889139.pdf
    • http://svp-steinmaur.ch/images/minecraft-windows-10-hack-client-2021_GM479516143.pdf
    • http://svp-steinmaur.ch/images/coin-master-free-spins-app_GM406889139.pdf
    • http://svp-steinmaur.ch/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://svp-steinmaur.ch/images/coin-master-golden-card-hack_GM406889139.pdf
    • http://svp-steinmaur.ch/images/village-4-coin-master_GM406889139.pdf
    • http://svp-steinmaur.ch/images/free-spins-coin-master-app-ios_GM406889139.pdf
    • http://svp-steinmaur.ch/images/free-stuff-on-roblox_GM431946152.pdf
    • http://svp-steinmaur.ch/images/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://svp-steinmaur.ch/images/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdf
    • http://svp-steinmaur.ch/images/free-robux-place_GM431946152.pdf
    • http://svp-steinmaur.ch/images/best-site-for-free-coin-master_GM406889139.pdf
    • http://svp-steinmaur.ch/images/avatar-roblox-game_GM431946152.pdf
    • http://svp-steinmaur.ch/images/gold-card-coin-master-free_GM406889139.pdf
    • http://svp-steinmaur.ch/images/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdf
    • http://svp-steinmaur.ch/images/hack-coin-master-for-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047eb.bin
82200bf6f9cf650ae2c3f081fd9ea03f6ce3543b8a7b23f504c16261cb1a97d0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47EB 25596 bytes
font_01_sfnt_off000080fc.bin
a96ac7afd25cadbabafd1b9dbf0a180d0c1833ed2d07acb4363f122556c39d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FC 18240 bytes

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