Malicious PDF — malware analysis report

Static analysis result for SHA-256 618d6dd089eac2db…

MALICIOUS

PDF

43.0 KB Created: 2021-05-15 23:30:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e4154a143c059e57ac9c88c2aaf1ed33 SHA-1: 6c31671699a5291be4541738b41728e53940eff4 SHA-256: 618d6dd089eac2dbb5a1ba4eb0f530f177e7c2ec211c0af726ccbfbfbfaa9b0f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which appear to be part of an SEO link farm designed to drive traffic to potentially malicious or scam-related content. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, contains references to 'Coin Master Free Spin' and a URL, suggesting a lure for game-related cheats or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-free-spin-redeem-code-game-hack
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/free-robux-for-free_GM431946152.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-easy_GM431946152.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/hacks-roblox_GM431946152.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/free-coins-for-planet-master-game_GM406889139.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/microsoft-robux_GM431946152.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-cheat_GM406889139.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/free-roblox-wings_GM431946152.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/roblox-fun-com-robux_GM431946152.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-gamepasses-on-roblox_GM431946152.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/free-minecraft-servers-to-join_GM479516143.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/coin-master-raid-hack_GM406889139.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-downgrade-minecraft-pe_GM479516143.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/lazy-blocks-com-free-robux_GM431946152.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/hack-coin-master-ios-download_GM406889139.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdf
    • https://kab-bangli.kpu.go.id/new/public/ckfinder/userfiles/files/unlimited-spin-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ca1.bin
4d5330aa3f110965cbb95b05eb846f08a1094264a5d674611da179199ab82a98		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CA1 25800 bytes
font_01_sfnt_off000085cd.bin
6dc583b2cf42d8f66261eb7e7ae0cb761f5dd774cb396d87b40b3163a1218d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85CD 18320 bytes

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