Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b0fee85d7a1456…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 17:09:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4442748f4ee54905aec1a67d664003cb SHA-1: 44f3386e22dacd57feb9e76371f58208d074959c SHA-256: e8b0fee85d7a14569535828fc1a10b84f97b141ee9ec7a805be43d7ee3758dc1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to external PDF files hosted on compromised or suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a tactic to manipulate search engine results or distribute content. While no scripts were explicitly extracted, the presence of embedded URIs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/406889139/freecoins-game-hack
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/pokmon-go-free-download-apk_GM1094591345.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/spin-coin-master-hack_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/free-spin-link-in-coin-master_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/legitimate-coin-master-free-spins-apk_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/free-coin-master-link-2021_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/minecraft-free-computer-game_GM479516143.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/coin-master-hack-apk-iphone_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/how-to-get-free-robux-without-offers_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/master-coin-free_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/free-minecraft-accounts-reddit_GM479516143.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/moon-active-games_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/coin-master-free-coins-and-spins-app_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/roblox-its-free_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/how-do-i-get-free-robux_GM431946152.pdf
    • https://kejari-denpasar.go.id/public/ckfinder/userfiles/files/roblox-toy-codes-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052ed.bin
3483b2390e6cfbc9b774f7c778c25bdeec1b69f2d4b619446631c84ac9c82839		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52ED 24232 bytes
font_01_sfnt_off00008a7e.bin
4ec770049b13c1817338702755f92eb60852bbcd88e9226f36e56b340238b42d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7E 3268 bytes
font_02_sfnt_off000095ea.bin
b7451c9dd0ac59d2b5cb55b76db2f7cf076c87adc9efeb70e2d733c8c551e0a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95EA 17380 bytes

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