Malicious PDF — malware analysis report

Static analysis result for SHA-256 391369dfd948c00c…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 05:18:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7f08e9736dcfeefdaa6669bf60e01f28 SHA-1: c8a9fc654f172d775f2a7af161005ad85bf6295e SHA-256: 391369dfd948c00ca24d8648d16fc14983bbe0b998fdcc2973091940718fdd58
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 game-related hacks and freebies. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, suggesting a link farm or phishing attempt. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking malicious links, likely to download further malware or engage in scams.

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-freebies-2021-game-hack
    • http://lib.uho.ac.id/library/repository/how-to-exploit-roblox_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-gratis_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-hack-android-root_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/are-tiktok-free-views-hack_GM835599320.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-hack-tool-for-pc_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/minecraft-pe-hacks-ios_GM479516143.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-free-pin_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdf
    • http://lib.uho.ac.id/library/repository/how-can-you-get-robux_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/coin-master-hack-2021-link_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/my-roblox-avatar_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/hack-coin-master-apk-ios_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/roblox-play-now-for-free_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/minecraft-apk-114-4_GM479516143.pdf
    • http://lib.uho.ac.id/library//repository/is-minecraft-java-free_GM479516143.pdf
    • http://lib.uho.ac.id/library/repository/free-robux-rewards_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030d5.bin
a0eaf154d3873c75885385ef9348458026bbaa422bb46277d78d9266e217ffc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30D5 23076 bytes
font_01_sfnt_off000064e4.bin
099d1788409087ddfbe33754abc9ceefd32c2cc39aea06ca7620bd436a009d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E4 18556 bytes

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