Malicious PDF — malware analysis report

Static analysis result for SHA-256 641690db9ae115bd…

MALICIOUS

PDF

35.8 KB Created: 2021-06-28 23:03:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7ace4aa45d59a9275dd822691b490055 SHA-1: 6bd9a87c7317c4ac02b6c013a49d857528857e4e SHA-256: 641690db9ae115bd325b15fc6292edb4d6fa0925f886b40542b0632b8743ceb1
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to files with names suggesting game cheats or hacks, and one direct link to an APK file. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly flagged this PDF as malicious. This suggests the document is designed to trick users into downloading malicious applications or visiting malicious sites.

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/apk-hack-roblox-2021-game-hack
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/slaying-simulator-cheats-roblox_GM431946152.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/pokemon-go-free-like-games_GM1094591345.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-please_GM431946152.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-moonactive_GM406889139.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spons-apk-2021_GM406889139.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-gamepasses-on-roblox_GM431946152.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-game-hack-app-download_GM406889139.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/point-prizes-free-robux_GM431946152.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/tiktok-free-google-home-mini_GM835599320.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-mod-apk-coin-master_GM406889139.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-gold-cards-hack_GM406889139.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-obby_GM431946152.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-hack_GM406889139.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/minecraft-windows-10-edition-hacked-client_GM479516143.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-spin-hack-link_GM406889139.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-ml_GM406889139.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-legit_GM406889139.pdf
    • https://puskesmasdenbar2.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-dll-cheats_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003398.bin
e67325be440058cae75c3bb08b2379efa6a16467745e398bb0261bae1c734510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3398 22804 bytes
font_01_sfnt_off00006636.bin
537f2e374ab9cf29db508694e93733cdefac73973314035e3a117d1d87657d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6636 19236 bytes

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