Malicious PDF — malware analysis report

Static analysis result for SHA-256 5579e00658934f55…

MALICIOUS

PDF

41.6 KB Created: 2021-05-14 16:31:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 562c54805cfb0d25c222616bde7df446 SHA-1: f8b26591aa052d1aa0bc4593b4b364edf20c60fb SHA-256: 5579e00658934f556f00583717990d41af99eee7eeb6d627ed4f3d76869dee9d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are part of a link farm designed to appear as legitimate content related to games and hacks. The primary malicious URL, https://netcdn.xyz/app/406889139/coin-master-spin-blogspot-game-hack, is likely a lure for malware or phishing. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to obfuscate the malicious intent through a large number of seemingly related but benign links.

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-spin-blogspot-game-hack
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/how-to-get-free-roblox-items_GM431946152.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/minecraft-rtx-download-free_GM479516143.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/1x1x1x1-roblox-id_GM431946152.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/is-there-a-free-version-of-minecraft_GM479516143.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-minecraft-account-generator_GM479516143.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/robloxmatchcom-free-robux_GM431946152.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/coin-master-facebook-free-spins_GM406889139.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/coin-master-hack-no-download_GM406889139.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/hack-coin-master-game-download_GM406889139.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/coin-master-app-free-download_GM406889139.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-robux-without-human-verification-real_GM431946152.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-robux-websites-that-work_GM431946152.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/100-free-spins-coin-master_GM406889139.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/coin-master-400-spin-link-today_GM406889139.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/coin-master-daily-free-spins_GM406889139.pdf
    • https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/app-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004799.bin
a663be92c3983f7e1ba5b2d87454d22d7ecb7b169594dc2946d8bc49d3dce1e7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4799 24600 bytes
font_01_sfnt_off00007fe0.bin
da6108506d645fcbe3414e0c69cdcf67670a59a1c8ef58446631e8e12bd9067e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE0 18300 bytes

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