Malicious PDF — malware analysis report

Static analysis result for SHA-256 623e09b3f9af6d6b…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 14:11:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6e87f616170f89f91b2f5f7ca5fe6bc9 SHA-1: c35f16445e0bd15cc3b0f6441ea68aea61266f00 SHA-256: 623e09b3f9af6d6bab68f96e3f963e66a8d4cb5e7fe059f5deeb1187e1f3ff94
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external resources related to free in-game currency and items. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier strongly flagged this PDF as malicious. The document body explicitly contains URLs that likely serve as lures for phishing or malware downloads.

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.tw/app/406889139/coin-master-free-coins-and-spins-link-today-game-hack
    • http://lib.uho.ac.id/library/repository/pokemon-go-free-team-change_GM1094591345.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-heaven-daily-free-spins_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/free-robux-earn_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/robux-generator-no-verification-needed_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/run-free-roblox-id_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/free-roblox-clothes-templates_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/roblox-royale-high-for-free_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/coin-master-mod-version-free-download-34-4_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/how-do-we-get-free-robux_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-app-download_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/roblox-vampire-hunters-2-wall-hack-how-to-do-it_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/minecraft-free-online-unblocked_GM479516143.pdf
    • http://lib.uho.ac.id/library//repository/free-robux-website_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/free-coins-2021-coin-master-link_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-play-online-free_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/free-minecraft-coins_GM479516143.pdf
    • http://lib.uho.ac.id/library/repository/hacked-client-for-minecraft-bedrock_GM479516143.pdf
    • http://lib.uho.ac.id/library/repository/how-can-i-play-minecraft-for-free_GM479516143.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-hack-tool_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003109.bin
c3b68a9b68f2342a3a2d13a027fec7a641f8a25f2a40836c101e1247be43536d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3109 22404 bytes
font_01_sfnt_off000062fc.bin
31669538ff40287ff7f58bdcd26457d43685aec4be0ef4186bcc350705393131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FC 18696 bytes

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