Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1789c2c18b4294…

MALICIOUS

PDF

45.1 KB Created: 2021-06-13 18:01:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e40d2d287cd3edc602f452465455755b SHA-1: e8bb7287e72627fbc4afb0d161153639666329eb SHA-256: 1b1789c2c18b42942fe0807ef5db756d98c44cee17487cc76dbd3c156995a89c
82 Risk Score

Malware Insights

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

The sample is a PDF that displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into interacting with malicious content. The document also contains an embedded URI pointing to a URL that promises free Robux, further reinforcing the lure. While no scripts were extracted, the presence of a fake CAPTCHA and a suspicious URL suggests an attempt to download a second-stage payload.

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 http://netcdn.co/app/431946152/how-to-get-loads-of-robux-for-free-game-hack
    • http://brinicombe.co.uk/images/how-to-get-20210-robux-on-roblox-no-hacks_GM431946152.pdf
    • http://brinicombe.co.uk/images/coin-master-firebird-card-free_GM406889139.pdf
    • http://brinicombe.co.uk/images/how-to-hack-people-in-roblox_GM431946152.pdf
    • http://brinicombe.co.uk/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • http://brinicombe.co.uk/images/login-robux_GM431946152.pdf
    • http://brinicombe.co.uk/images/free-robux-earn_GM431946152.pdf
    • http://brinicombe.co.uk/images/robuxy-com-free-robux_GM431946152.pdf
    • http://brinicombe.co.uk/images/what-is-exploiting-in-roblox_GM431946152.pdf
    • http://brinicombe.co.uk/images/robloxcity-robux-free_GM431946152.pdf
    • http://brinicombe.co.uk/images/roblox-high-school-for-free-to-play_GM431946152.pdf
    • http://brinicombe.co.uk/images/free-online-minecraft-server_GM479516143.pdf
    • http://brinicombe.co.uk/images/how-to-hack-to-get-robux_GM431946152.pdf
    • http://brinicombe.co.uk/images/roblox-hack-for-lumber-tycoon-2_GM431946152.pdf
    • http://brinicombe.co.uk/images/free-robux-2021_GM431946152.pdf
    • http://brinicombe.co.uk/images/coin-master-free-spins-hack_GM406889139.pdf
    • http://brinicombe.co.uk/images/roblox-its-free_GM431946152.pdf
    • http://brinicombe.co.uk/images/robloxheroxyz-free-robux_GM431946152.pdf
    • http://brinicombe.co.uk/images/coin-master-free-gifts_GM406889139.pdf
    • http://brinicombe.co.uk/images/roblox-games-free-roblox-games_GM431946152.pdf
    • http://brinicombe.co.uk/images/roblox-fun-com-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e0b.bin
eab8db634351c97a40f16dcd6dbab21571efe7ba3f64e2ba453c9a9b63c29af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E0B 27912 bytes
font_01_sfnt_off00008c78.bin
1528a159a45d3e0328d2de57d8ab0d20f693b64f0fa37354bdfdeb36ce238e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C78 18684 bytes

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