Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff0c5cc862cd972…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 18:42:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d2b2ffe145b4c1a23915730ec4bef2d0 SHA-1: 7fb0b85955870bbd8e4edab3af093b4d69acfaa5 SHA-256: 9ff0c5cc862cd9725033862d3da66fe5b02e3fb20fdecb1a488c354b1542b0f9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a malicious lure, specifically a fake CAPTCHA or human verification prompt designed to deceive the user. It contains an embedded URI pointing to a suspicious URL, likely intended for downloading a secondary payload. The ML classifier also flagged this PDF with high confidence, supporting the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/431946152/www-rubux-game-hack
    • https://www.wcauk.org/uploads/files/files/how-do-you-earn-robux_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/free-roblox-executor_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/free-minecraft-generator_GM479516143.pdf
    • https://www.wcauk.org/uploads/files/files/free-robux-generator-no-verification_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/tiktok-free_GM835599320.pdf
    • https://www.wcauk.org/uploads/files/files/free-robux-on-phone_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/roblox-hack-download-pc_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/coin-master-spin-free_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/free-minecraft-account_GM479516143.pdf
    • https://www.wcauk.org/uploads/files/files/free-robux-without-downloading-apps_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/coin-master-daily-free-coins-link_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/free-minecraft-alt-accounts_GM479516143.pdf
    • https://www.wcauk.org/uploads/files/files/tiktok-free-or-paid_GM835599320.pdf
    • https://www.wcauk.org/uploads/files/files/free-spin-today-coin-master_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/games-to-get-free-robux_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/daily-coin-master-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e14.bin
5652ceea3873b162f96b83960385689026c786934e2971b71334ebb2f1be28c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E14 25292 bytes
font_01_sfnt_off000086d3.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
pdf-font-stream PDF embedded font (sfnt) at offset 0x86D3 5596 bytes
font_02_sfnt_off0000937b.bin
fc38c016acc36c76b7a0729eb2c8d98b0fd59e97c8a3cfb4a698daadf76a8d1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x937B 18068 bytes