Malicious PDF — malware analysis report

Static analysis result for SHA-256 f133f12e8d7c08c8…

MALICIOUS

PDF

43.5 KB Created: 2021-05-12 04:34:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8a823a66b7f64491575e2bfff9c553a4 SHA-1: dfa3d82030047cfe0ffccb505380f774c54fa804 SHA-256: f133f12e8d7c08c827ac5b06809554ffc42886fcadbb60dbb86a7f2d0b4677e1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, forming a link farm designed to attract users searching for game hacks and cheats. The primary URL points to a download for 'hacking apps for Roblox', and the numerous other URLs on 'oca.undil.tl' and 'netcdn.xyz' reinforce this theme. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic suggests a deceptive user interface. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/431946152/hacking-apps-for-roblox-game-hack
    • http://oca.undil.tl/repository/coin-master-free-coins-link-blogspot_GM406889139.pdf
    • http://oca.undil.tl/repository/coin-master-hack-apk-download-2021_GM406889139.pdf
    • http://oca.undil.tl/repository/roblox-robux-generator-no-human-verification_GM431946152.pdf
    • http://oca.undil.tl/repository/microsoft-roblox_GM431946152.pdf
    • http://oca.undil.tl/repository/op-rewards-free-robux_GM431946152.pdf
    • http://oca.undil.tl/repository/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://oca.undil.tl/repository/roblox-free-robux-no-verification_GM431946152.pdf
    • http://oca.undil.tl/repository/how-to-earn-free-robux_GM431946152.pdf
    • http://oca.undil.tl/repository/coin-master-hack-apk-ios_GM406889139.pdf
    • http://oca.undil.tl/repository/rbxoffers-com-free-robux_GM431946152.pdf
    • http://oca.undil.tl/repository/roblox-free-item-codes_GM431946152.pdf
    • http://oca.undil.tl/repository/rbx-place-free-robux_GM431946152.pdf
    • http://oca.undil.tl/repository/coin-master-free-coins-2021_GM406889139.pdf
    • http://oca.undil.tl/repository/inappropriate-roblox-games_GM431946152.pdf
    • http://oca.undil.tl/repository/minecraft-java-edition-free-code_GM479516143.pdf
    • http://oca.undil.tl/repository/coin-master-free-spins-for-today_GM406889139.pdf
    • http://oca.undil.tl/repository/minecraft-java-edition-for-free_GM479516143.pdf
    • http://oca.undil.tl/repository/how-to-get-robux-easy_GM431946152.pdf
    • http://oca.undil.tl/repository/hack-card-collection-coin-master_GM406889139.pdf
    • http://oca.undil.tl/repository/minecraft-pe-apk-free-download_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ea.bin
b19cdfd0121a60c8c81c61d11d39352e8cd0d21362eab713eb64d5ab297dbcae
pdf-font-stream PDF embedded font (sfnt) at offset 0x48EA 27252 bytes
font_01_sfnt_off0000859a.bin
a12a900017875743d46ad83be25c63e25fa00e3014bd6d438c4b8f248ab77b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x859A 18932 bytes