Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c049ad0fc2ede13…

MALICIOUS

PDF

46.5 KB Created: 2021-05-17 18:33:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e8d9dc2fb9ea1e14335e77b30511c270 SHA-1: 6e8cab65b2648d2a5c894884dfd24fa58131b37e SHA-256: 3c049ad0fc2ede1379aae23c5957bb76defe999c44469fbf75edd3e58573d5d9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, identified as a link farm, likely intended to drive traffic to SEO-optimized pages or to host malicious downloads. The primary URL found is https://netcdn.xyz/app/406889139/coin-master-70-spin-link-game-hack, and many other links point to PDF files on samsoncc.com, suggesting a content-spinning or link-distribution scheme. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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-70-spin-link-game-hack
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-35-13-hack-download_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/real-robux-generator-2021_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-free-spins-apk_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/roblox-redeem-card-codes-free_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-mods-for-coin-master_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/robux-hacks-2021_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-robux-place_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-unlimited-spin-apk-free-download_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/easy-how-to-get-free-robux_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-pc-hack-tool_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-online-minecraft-server_GM479516143.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-32-mod-hack-unlimited_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/rbxoffers-earn-free-robux_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-hack-unlimited-spins-apk_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cc1.bin
bdb7fbb31b1abd5c19b4dee8021eb46f757b22d040df45d414ad301cd80c9d74		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC1 29836 bytes
font_01_sfnt_off0000897d.bin
601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897D 2920 bytes
font_02_sfnt_off00009397.bin
cf85675b6a38e731fca5e28061fbf46a28a3be773b5a4bb5d31cd4a045e3febb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9397 18120 bytes

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