Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e9331618afb7a2…

MALICIOUS

PDF

45.1 KB Created: 2021-05-12 09:40:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4456be68604c72a5accca6126e4b75b0 SHA-1: e2dd779bf8e2f16e849d115c9037715e1614a2c1 SHA-256: b5e9331618afb7a2865bca12cc540d6b2810d12e6244663006c9f4615f2208bd
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, pointing to sites offering game cheats and hacks. The primary URL, 'https://netcdn.xyz/app/406889139/coin-master-hack-tips-game-hack', is likely a distribution point for malware or a phishing lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a coordinated effort to drive traffic to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/406889139/coin-master-hack-tips-game-hack
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/blogspot-free-spins-coin-master_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-download-2021_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/https-rbx-place-rewards_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/www-roblox-com-robux_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/best-free-robux-sites_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/free-links-coin-master_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/free-spins-on-coin-master-generator_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/unlimited-spin-coin-master-hack_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/install-free-game-coin-master_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/i-robux_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/coin-master-hacks-no-verification_GM406889139.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-not-a-scam_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdf
    • https://kpu-tabanankab.go.id/new/public/ckfinder/userfiles/files/minecraft-java-edition-key-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b99.bin
fb79586e106b8a82d2c62087f3db8d3b38d53c42fe255e90f223a62f5d243fb6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B99 24828 bytes
font_01_sfnt_off00008490.bin
2dc442bec2876772b2b8d4b50a4abf064217aa7912c99c219d8694ed3db7bda1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8490 3000 bytes
font_02_sfnt_off00008ef0.bin
1fa242315f10f3fa2c9711447fa9857a94e1f1f203c41df7b4d39f1f5d94ad78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF0 17892 bytes

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