Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff50a6bab8edc65…

MALICIOUS

PDF

41.7 KB Created: 2021-05-16 16:10:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5e46797135a7227d8b281d4fd027abe8 SHA-1: 37eda0c2a44e896921f06892d49d86a369daf6d2 SHA-256: cff50a6bab8edc65620eeef9cff3c53093197489e930b8a8f806e742487dc675
82 Risk Score

Malware Insights

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

The document contains a fake CAPTCHA lure, designed to trick users into performing an action that likely leads to malware execution. It also embeds multiple URLs, one of which is directly linked to the fake CAPTCHA prompt, suggesting a download or redirection to malicious content. The ML classifier strongly flagged this PDF as malicious.

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/archery-master-3d-apk-and-mod-free-download-unlimited-coins-game-hack
    • http://lv-siegen.de/images/free-minecraft-capes_GM479516143.pdf
    • http://lv-siegen.de/images/free-minecraft-hosting_GM479516143.pdf
    • http://lv-siegen.de/images/reddit-coin-master-free-spins_GM406889139.pdf
    • http://lv-siegen.de/images/www-coinmaster-com_GM406889139.pdf
    • http://lv-siegen.de/images/roblox36com-free-robux_GM431946152.pdf
    • http://lv-siegen.de/images/robux-boost_GM431946152.pdf
    • http://lv-siegen.de/images/coin-master-homepage_GM406889139.pdf
    • http://lv-siegen.de/images/roblox-free-robux-no-verification_GM431946152.pdf
    • http://lv-siegen.de/images/do-you-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://lv-siegen.de/images/coin-master-hack-software_GM406889139.pdf
    • http://lv-siegen.de/images/coin-master-free-spin-link-daily_GM406889139.pdf
    • http://lv-siegen.de/images/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • http://lv-siegen.de/images/games-that-give-you-free-robux_GM431946152.pdf
    • http://lv-siegen.de/images/how-to-block-someone-on-coin-master_GM406889139.pdf
    • http://lv-siegen.de/images/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://lv-siegen.de/images/how-to-get-free-robux-no-verification_GM431946152.pdf
    • http://lv-siegen.de/images/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdf
    • http://lv-siegen.de/images/hack-spin-coin-master_GM406889139.pdf
    • http://lv-siegen.de/images/free-spins-coin-master_GM406889139.pdf
    • http://lv-siegen.de/images/best-free-minecraft-hacked-client_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000462b.bin
dce97f115c78fe86c7390844fee74f228ee9c418587bca29058c26ac31220738		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x462B 23828 bytes
font_01_sfnt_off00007c99.bin
1f4db19c4ad26965eb53476f7a038d439f2d42a62f857c7cf6da591de7fc7d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C99 19600 bytes

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