Malicious PDF — malware analysis report

Static analysis result for SHA-256 0214190c1da3db1e…

MALICIOUS

PDF

35.9 KB Created: 2021-07-09 09:11:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9d33c6af2d969a896aba68f2e9121b69 SHA-1: 92a34ce9e8b06418ae707fa5391da3fde5ddb530 SHA-256: 0214190c1da3db1e8216308b704242bb0750d25d16f234f021ca14020f72d766
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body that promotes free Robux and Coin Master spins, a common lure for phishing or malware distribution. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm designed to attract users searching for these terms. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/431946152/what-games-on-roblox-give-you-free-robux-game-hack
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-robux-on-phone_GM431946152.pdf
    • https://resmed.ear.com.tw/image/data/files/free-robux-youtube_GM431946152.pdf
    • https://resmed.ear.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://resmed.ear.com.tw/image/data/files/robuxy-com-free-robux_GM431946152.pdf
    • https://resmed.ear.com.tw/image/data/files/free-robux-no-password-or-username-may_GM431946152.pdf
    • https://resmed.ear.com.tw/image/data/files/mosttechs-coin-master-free-spins_GM406889139.pdf
    • https://resmed.ear.com.tw/image/data/files/free-coin-link-for-coin-master_GM406889139.pdf
    • https://resmed.ear.com.tw/image/data/files/coin-master-free-daily-spins-today_GM406889139.pdf
    • https://resmed.ear.com.tw/image/data/files/robux-sign_GM431946152.pdf
    • https://resmed.ear.com.tw/image/data/files/fly-cheat-in-roblox-engine_GM431946152.pdf
    • https://resmed.ear.com.tw/image/data/files/free-spins-for-coin-master-game_GM406889139.pdf
    • https://resmed.ear.com.tw/image/data/files/rbx-com_GM431946152.pdf
    • https://resmed.ear.com.tw/image/data/files/roblox-hack-me-robux_GM431946152.pdf
    • https://resmed.ear.com.tw/image/data/files/google-coin-master-free-spins_GM406889139.pdf
    • https://resmed.ear.com.tw/image/data/files/hack-coin-master-ios-download_GM406889139.pdf
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • https://resmed.ear.com.tw/image/data/files/coin-master-hack-ios-no-verification_GM406889139.pdf
    • https://resmed.ear.com.tw/image/data/files/free-robux-picture_GM431946152.pdf
    • https://resmed.ear.com.tw/image/data/files/free-premium-roblox_GM431946152.pdf
    • https://resmed.ear.com.tw/image/data/files/robux-giver_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003185.bin
fa601abe363372d52535a2a5635a0066a5cd22fc425def22874359477575a9d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x3185 22812 bytes
font_01_sfnt_off000064cb.bin
8b19fd13ad5b08f11d9c4597e6f2a0c04d71b28f89248dcac2f5c29d09b121fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x64CB 19916 bytes