Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db3e4a864a4b5fa…

MALICIOUS

PDF

33.6 KB Created: 2021-07-04 10:53:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 30ddc6cb68bb645625594f1f72f81ba1 SHA-1: c401ced2be4736750c12e8cbfe4d7cf5b9a5b4f1 SHA-256: 3db3e4a864a4b5fa1159cbd20d4f1ed754417489357e5eb8049de295c85bc12f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering 'free Robux' or 'Coin Master' cheats. The document body explicitly contains a call to action to 'CLICK HERE TO ACCESS ROBUX GENERATOR', indicating a scam or phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/free-roblox-accounts-2021-with-robux-game-hack
    • http://shoruq.sch.ae/userfiles/files/how-to-get-free-robux-in-roblox-2021-no-download_GM431946152.pdf
    • http://shoruq.sch.ae/userfiles/files/free-robux-robux-zone-wordpress_GM431946152.pdf
    • http://shoruq.sch.ae/userfiles/files/how-to-get-robux-on-phone_GM431946152.pdf
    • http://shoruq.sch.ae/userfiles/files/free-robux-only-username-no-human-verification_GM431946152.pdf
    • http://shoruq.sch.ae/userfiles/files/coin-master-hack-355_GM406889139.pdf
    • http://shoruq.sch.ae/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdf
    • http://shoruq.sch.ae/userfiles/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdf
    • http://shoruq.sch.ae/userfiles/files/rbxcity-free-robux_GM431946152.pdf
    • http://shoruq.sch.ae/userfiles/files/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdf
    • http://shoruq.sch.ae/userfiles/files/cheat-mine-simulateur-roblox_GM431946152.pdf
    • http://shoruq.sch.ae/userfiles/files/roblox-cbro-how-to-get-free-knife_GM431946152.pdf
    • http://shoruq.sch.ae/userfiles/files/coin-master-hack-programmers_GM406889139.pdf
    • http://shoruq.sch.ae/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://shoruq.sch.ae/userfiles/files/free-spins-for-coin-master-game_GM406889139.pdf
    • http://shoruq.sch.ae/userfiles/files/how-to-get-coin-master-free-spins-in-email_GM406889139.pdf
    • http://shoruq.sch.ae/userfiles/files/free-robux-oin-1-sec_GM431946152.pdf
    • http://shoruq.sch.ae/userfiles/files/is-minecraft-earth-free_GM479516143.pdf
    • http://shoruq.sch.ae/userfiles/files/free-800-robux_GM431946152.pdf
    • http://shoruq.sch.ae/userfiles/files/robux-com-free-robux_GM431946152.pdf
    • http://shoruq.sch.ae/userfiles/files/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002a7c.bin
36841b1a3b6eb8bdca8c54f1a675617e8cc577b1c03ab66af3488449c46afa47
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A7C 22616 bytes
font_01_sfnt_off00005c65.bin
a55470c357d6117f87c66cfcc5dd60461d5ad292bd735cfee1ec5bb843310ba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C65 19780 bytes