Malicious PDF — malware analysis report

Static analysis result for SHA-256 64635d46c0f26ed9…

MALICIOUS

PDF

46.8 KB Created: 2021-06-09 12:01:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8ccafcf4b4a6bdc55e7963a5d46d5003 SHA-1: 942544d86396e9cd4633be65c3d351dfbd3a139c SHA-256: 64635d46c0f26ed983afdd90acae854eb31d1d0728f6dd922fed375db6d03134
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 the user into interacting with a malicious link. The embedded URL and numerous other URLs point to sites offering cheats or hacks, suggesting a lure for potentially unwanted software or further malicious downloads. No scripts were extracted, but the presence of a fake CAPTCHA and external links strongly indicates a phishing or social engineering attempt.

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/hack-robux-2021-free-game-hack
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/business-simulator-roblox-cheat_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-robux-not-fake_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/roblox-gift-card-online-free_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/roblox-hacker-mask-tshirts-images_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-spin-link-today-2021_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-roblox-shirts-templates_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/roblox-builders-club-free_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/hack-free-spin-coin-master_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/jaibreak-hack-roblox-script-auto-aresst_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-robux-offers_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/roblox-sued_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/minecraft-hack-ios_GM479516143.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-free-robux_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/play-roblox-for-free-on-google_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-robux-generator-no-verification_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/get-free-spins-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000058cf.bin
234f698850e5b6c4c91b9ac98a62924f9e9519e92b96a5d2ee55b8c4fe764331		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x58CF 25160 bytes
font_01_sfnt_off000092f3.bin
5d3d7267f3110da415bade5e94a11952a8799abcdc8f8141a259ab996b0ad9b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F3 18816 bytes

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