Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa53df8d307a3e0…

MALICIOUS

PDF

42.8 KB Created: 2021-06-13 23:29:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bf75aed37dffdddb71b6291f37d8cec6 SHA-1: db38f11cf5c6c8362485a22b518ee9c982c7de90 SHA-256: 8fa53df8d307a3e0f9fdc2b65156b7e005aa8c27ba11511d7376a445402167d3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, many of which are presented as "free" game-related content. The heuristic 'PDF_SEO_LINK_FARM' indicates a link farm, and the ML classifier strongly suggests maliciousness. The document's primary purpose appears to be to drive traffic to these external URLs, likely for the purpose of distributing malware or engaging in phishing.

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 http://netcdn.co/app/431946152/free-house-for-meep-city-roblox-game-hack
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-cards_GM406889139.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/pubg-uc-redeem-code-midasbuy_GM1330123889.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/roblox-free-robux-obc-codes_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-android_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/roblox-free-robux-give-away-lve_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/roblox-editable-invitation-template-free_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-use-wurst_GM479516143.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/free-exploits-for-roblox_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/roblox-got-talent-piano-hack_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/roblox-gta-5-hack_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/free-online-minecraft-server_GM479516143.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-hack-unblock-roblox_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/claim-coin-master-free-spins_GM406889139.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/static-moonactive-net-link_GM406889139.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-get-free-robux-download-pc_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • http://pustaka.minangkabau.unand.ac.id/repository/old-roblox-accounts-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aeb.bin
a8bc01eca84da886ebfc055aa2147abc2aae942a3c065e1343f278c235065b92		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEB 24564 bytes
font_01_sfnt_off00008337.bin
63ebfed187f5825e43da134f9e17965eec8f46a69b0e3db629ae72cf514d870c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8337 18864 bytes

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