Malicious PDF — malware analysis report

Static analysis result for SHA-256 f139bad947929b3a…

MALICIOUS

PDF

35.7 KB Created: 2021-07-03 14:05:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bd64a22e324ce766bfe7873c93070de8 SHA-1: ebade07d483d7ab36adf0c6d79095ae6824ee646 SHA-256: f139bad947929b3a945e6441a7ba64e8b89a59a6ed6823fcf7dbb5ac2375728f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF documents promising free in-game currency or hacks for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the extensive link farm suggests a phishing or malware distribution 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 http://netcdn.tw/app/431946152/roblox-avatar-maker-free-game-hack
    • http://perpustakaan.yudharta.ac.id/etj/repository/free-robux-generator-2021-robux-hack-no-survey-updated_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/roblox-hack-generator-no-survey-no-download_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/roblox-free-codes-that-make-things-free_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/get-free-robux-easy-2021_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/pokemon-go-free-km_GM1094591345.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/coin-master-unlimited-spins-hack_GM406889139.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/coin-master-hack-dot-xyz_GM406889139.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/money-hack-roblox-adopt-me_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/free-roblox-codes-to-get-robux_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/is-it-cheating-to-use-a-autoclicker-in-roblox_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/get-free-lp-on-roblox_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/roblox-comcom_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/minecraft-free-download-laptop_GM479516143.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/hackes-de-roblox-en-mini-guegos_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/roblox-hack-prision-life-2021_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/counter-blox-roblox-offensive-free-skins-download_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/how-to-get-free-robux-working-november-2021_GM431946152.pdf
    • http://perpustakaan.yudharta.ac.id/etj/repository/minecraft-multiplayer-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033a8.bin
699a954497a63760453fa4dcf833519972a87cde20a928ab7ceaaad69bf455fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33A8 22500 bytes
font_01_sfnt_off000065e7.bin
6e0682d0e3debb2d4c4c9a17f2eb9a9f2fd830994e30009324975d898f503a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E7 19236 bytes

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