Malicious PDF — malware analysis report

Static analysis result for SHA-256 6776f21731ec80a5…

MALICIOUS

PDF

42.1 KB Created: 2021-05-17 06:32:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2095c1b3baf643b6ba14806a175172c0 SHA-1: 02a3ec29d068e6192993e8387158426866cb31a5 SHA-256: 6776f21731ec80a565261d5ba351eae2d5b79559467f705638858e5855e90bf7
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or human verification prompt to trick users into clicking a link. The embedded URL, https://netcdn.xyz/app/431946152/www-free-robux-game-hack, likely leads to the download of a second-stage payload. The document's content and heuristics strongly suggest a social engineering lure for malware distribution.

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/431946152/www-free-robux-game-hack
    • http://homebackpackers.com/images/free-coin-master-coins_GM406889139.pdf
    • http://homebackpackers.com/images/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdf
    • http://homebackpackers.com/images/best-way-to-get-free-robux_GM431946152.pdf
    • http://homebackpackers.com/images/free-roblox-passwords_GM431946152.pdf
    • http://homebackpackers.com/images/coin-master-hack-online-without-human-verification_GM406889139.pdf
    • http://homebackpackers.com/images/earn-free-robux_GM431946152.pdf
    • http://homebackpackers.com/images/minecraft-realms-free-trial_GM479516143.pdf
    • http://homebackpackers.com/images/free-robux-hack-generator_GM431946152.pdf
    • http://homebackpackers.com/images/free-minecraft-server-hosting-with-plugins_GM479516143.pdf
    • http://homebackpackers.com/images/getrobux-come_GM431946152.pdf
    • http://homebackpackers.com/images/roblox-free-robux-hack_GM431946152.pdf
    • http://homebackpackers.com/images/coin-master-free-2021-spin-link-today_GM406889139.pdf
    • http://homebackpackers.com/images/coin-master-free-spin-daily-link_GM406889139.pdf
    • http://homebackpackers.com/images/get-robux-com_GM431946152.pdf
    • http://homebackpackers.com/images/free-robux-codes-2021-not-used_GM431946152.pdf
    • http://homebackpackers.com/images/roblox-com-free-robux_GM431946152.pdf
    • http://homebackpackers.com/images/coin-master-daily-rewards_GM406889139.pdf
    • http://homebackpackers.com/images/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://homebackpackers.com/images/how-to-coin-master-hack_GM406889139.pdf
    • http://homebackpackers.com/images/websites-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004699.bin
d9baf23f56d7863ffe2aab810fdc37c93d65b39c432fa080e1900a1fc4b48262		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4699 26312 bytes
font_01_sfnt_off00008203.bin
3afa3067d1f3c9d8d4e5028784d7d2a7352a3b977a914758f486701e4d265e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8203 18376 bytes

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