Malicious PDF — malware analysis report

Static analysis result for SHA-256 772193a1479b9eb9…

MALICIOUS

PDF

34.8 KB Created: 2021-06-28 12:44:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 633df581df9ed80cce2fe3d0aeb60645 SHA-1: 51745dcd4458eb43e889e2dc24a92cc14d93e5b6 SHA-256: 772193a1479b9eb9e8b2009b7d2b6cfe2f0f4a734362a99a715d192c5bbe6658
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, presented as a 'link farm', that promise free in-game currency for popular games like Roblox. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to potentially malicious websites or download further payloads. No scripts were extracted, but the overall structure and content point towards a phishing or scam attempt.

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.co/app/431946152/free-roblox-cookies-2021-game-hack
    • http://pet.nfe.go.th/petnfe/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/roblox-free-robux-no-verification_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/is-minecraft-education-edition-free_GM479516143.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/roblox-cheat-robux_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/best-free-spins-link-coin-master_GM406889139.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/roblox-cheat-engine-2021-may_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-coin-master-spin-app_GM406889139.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/coin-master-free-blogspot_GM406889139.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-robux-scam_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/coin-master-free-spins-save_GM406889139.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-mobile-360-free-robux_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-robux-mod_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-robux-oin-1-sec_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/roblox-speed-hack-script-pastebin-2021_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/how-to-hack-coin-master-cheat-engine_GM406889139.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-roblox-promo-c_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003119.bin
dc825b46dfb4ea404319be097dfadc74476646777b8bfa554187d8ce68422bc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x3119 22096 bytes
font_01_sfnt_off0000620c.bin
8688fac326ca2a933627ed4af78e47cdb313c40c23017ae35b38086c367fcf2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x620C 19340 bytes