Malicious PDF — malware analysis report

Static analysis result for SHA-256 8804a664e3b7deac…

MALICIOUS

PDF

43.4 KB Created: 2021-05-11 16:09:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: abc82ee66fee7fcafca26ecc6143ee69 SHA-1: afd0c1c9c08b8fd8c9a8788e879d9171d459a204 SHA-256: 8804a664e3b7deac3ca1426834924a88108dda68ca2eea537376465b4392b6be
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick users into downloading further malicious content. It contains multiple embedded URLs, one of which is directly linked to a lure for 'robux hack tools'. The ML classifier strongly flagged this PDF as malicious, supporting the observed social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/robux-hack-tools-game-hack
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-apkmody_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/roblox-getting-hacked_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-com-roblox_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-robux-android_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-get-20210-robux-for-free_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-ios-2021_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/robux-money_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/claimrobux-net_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/roblox-promo-codes-free-robux_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/minecraft-classic-free_GM479516143.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/withdraw-robux_GM431946152.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-spins-on-coin-master-app_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/free-role-in-coin-master_GM406889139.pdf
    • https://brooklandsfarmparents.co.uk/admin/ckfinder/userfiles/files/roblox-jailbreak-hack-download_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048f5.bin
2bcc91d4794e32cc48cee45ead53cf93df955c0097c0f7ab653391f7021ea706		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48F5 28040 bytes
font_01_sfnt_off00008704.bin
cf6d0fcc2a7c18e0ae1e84145e037068603b130caaef77e993c358e364abbe1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8704 18320 bytes

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