Malicious PDF — malware analysis report

Static analysis result for SHA-256 51853cc53961acb4…

MALICIOUS

PDF

44.8 KB Created: 2021-05-17 18:30:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e9e2adcbebe5542322bb4d81b1dc2e6e SHA-1: afec73f35c1b103767e1e460da70da57985d8dd6 SHA-256: 51853cc53961acb4cfbfa88ffa6fc4909984fb05eab9f7383d40cdf11ecba00a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to sites offering game-related cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests a phishing or malware distribution attempt. The document body, though partially corrupted, contains a URL that likely serves as the primary lure.

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 https://netcdn.xyz/app/406889139/free-spins-on-coin-master-link-game-hack
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-spins-for-coin-master-hack_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-apk-2021-ios_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-com-free-robux_GM431946152.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-online-android_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-game-download-mod-apk_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-hacks-2021_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-gift-link_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-mod-apk-35-8_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-real-working_GM431946152.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/get-free-robux-now_GM431946152.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/no-verification-coin-master-hack_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/clean-master-coins-hack_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-make-robux_GM431946152.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-fun-hack-online_GM406889139.pdf
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e35.bin
1b916771ee248b1fc532b4ddd96a73ffaaf925461688db3b2d1f22eda6513fc1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E35 30804 bytes
font_01_sfnt_off00008d82.bin
892ebf3b86ae534fd3f474e2c239da2a9bb4dc91f8225dc09222a78aadec1336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D82 18056 bytes

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