Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f401b789328b7d0…

MALICIOUS

PDF

47.4 KB Created: 2021-05-16 08:34:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4d8bd998394add8fc0a375540a4de90e SHA-1: e7c79745cf1fea61a0cc83ddfa909edd55f71e3f SHA-256: 8f401b789328b7d01a1e853ad038be1f227e07bc32a6b7f467476b63dcfc699f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document presents a fake CAPTCHA lure to trick users into clicking a link, which is a common social engineering tactic. The embedded URL and numerous other URLs point to sites offering 'free Robux' or 'Coin Master' cheats, reinforcing the phishing pretext. While no scripts were directly extracted, the PDF structure and ML classifier indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/how-do-you-get-free-robux-without-paying-game-hack
    • http://fs4sms.com/images/20210-free-spin-links-for-coin-master_GM406889139.pdf
    • http://fs4sms.com/images/roblox-generator_GM431946152.pdf
    • http://fs4sms.com/images/coin-master-cheats-and-hacks_GM406889139.pdf
    • http://fs4sms.com/images/no-scam-free-robux_GM431946152.pdf
    • http://fs4sms.com/images/how-to-robux_GM431946152.pdf
    • http://fs4sms.com/images/free-robux-ad_GM431946152.pdf
    • http://fs4sms.com/images/to-get-free-robux_GM431946152.pdf
    • http://fs4sms.com/images/how-to-get-free-cards-in-coin-master_GM406889139.pdf
    • http://fs4sms.com/images/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdf
    • http://fs4sms.com/images/coin-master-spins-free-2021_GM406889139.pdf
    • http://fs4sms.com/images/free-25-spins-coin-master-links_GM406889139.pdf
    • http://fs4sms.com/images/minecraft-windows-10-hack-client-2021_GM479516143.pdf
    • http://fs4sms.com/images/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdf
    • http://fs4sms.com/images/op-rewards-free-robux_GM431946152.pdf
    • http://fs4sms.com/images/robux-free-online_GM431946152.pdf
    • http://fs4sms.com/images/can-i-get-robux-for-free_GM431946152.pdf
    • http://fs4sms.com/images/minecraft-apk-download-free-11-055_GM479516143.pdf
    • http://fs4sms.com/images/how-to-play-minecraft-with-friends-for-free_GM479516143.pdf
    • http://fs4sms.com/images/roblox-hack-tool_GM431946152.pdf
    • http://fs4sms.com/images/how-to-get-free-robux-inspect_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000490e.bin
b771ca6fc3ac622a466e8d15e6749e46a7f03d50ca1ec7d02d23dbbf54c25c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x490E 24828 bytes
font_01_sfnt_off00008190.bin
ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8190 6700 bytes
font_02_sfnt_off000091ce.bin
5d1001e3ac77277796354ae1628373f4f4a3ba3fa344903a86c4555bafe1b783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91CE 19948 bytes

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