Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a04a4673fe9aaf…

MALICIOUS

PDF

46.9 KB Created: 2021-06-07 16:48:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e6c039bd31d7607dd1e6079e09c4f834 SHA-1: 2c4d9e2d672c11166be69ea427d10472b5850338 SHA-256: 27a04a4673fe9aaf7c6725987618f0af79103c3ab5875aa3855c390e78b1acd6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a lure, presenting a fake CAPTCHA to trick users into clicking a link. The embedded URL and document body content, which mentions free Robux and game hacks, strongly suggest a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/roblox-free-robux-code-april-2021-game-hack
    • https://www.poc-helmet.com/ckfinder/userfiles/files/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-apk_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/roblox-free-hats_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-minecraft-hosting_GM479516143.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/master-hack-coin_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/gold-card-coin-master-free_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/minecraft-download-free-download_GM479516143.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/a-lot-of-robux_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/minecraft-apk-free-download_GM479516143.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-free-coins-link_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-100-robux_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/how-to-hack-coin-master-pc_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/roblox-adopt-me-hack_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/best-free-minecraft-hacked-client_GM479516143.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/microsoft-bing-robux_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/how-can-i-get-free-robux_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/microsoft-rewards-robux_GM431946152.pdf
    • https://www.roblox.co
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005499.bin
3925252903a41de43de12acb16054bbb010512178b11d19a0fa7d7adb9ddd05e
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5499 26824 bytes
font_01_sfnt_off000092e2.bin
7e24b9563f857c9d5265459f694840b43a2ec4f475ec4825aea5e9eb7466c799
pdf-font-stream PDF embedded font (sfnt) at offset 0x92E2 18960 bytes