Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b1cc64fe1bc8cd…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 02:07:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 509af5e4ede82f0276e7778c6580e064 SHA-1: 7eb9207f9d005ea4bd3a092af971c6be379dd7a5 SHA-256: b8b1cc64fe1bc8cde2d4fe23ccd734a79b37242b041439e38c064d6015cff472
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, identified as a link farm, likely intended to redirect users to malicious websites. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests a potential for malware distribution or SEO spam. No scripts were extracted, but the document's structure and URL patterns are indicative of a phishing or spamming campaign.

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/free-spin-appscoin-master-game-hack
    • http://library.atim.ac.id/repository/vehicle-simulator-roblox-money-hack_GM431946152.pdf
    • http://library.atim.ac.id/repository/coin-master-free-spin-software_GM406889139.pdf
    • http://library.atim.ac.id/repository/how-to-hack-robux-into-your-roblox-account_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-robux-2021_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-get-free-robux-on-fortnite_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-roblox-accounts-with-robux-that-work-bugmenot_GM431946152.pdf
    • http://library.atim.ac.id/repository/hackeando-ordenadores-en-roblox_GM431946152.pdf
    • http://library.atim.ac.id/repository/coin-master-free-spins--coins-2021_GM406889139.pdf
    • http://library.atim.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-play-now-for-free-as-guest_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-its-free_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-robux-hack-tampermonkey_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-inf-jump-in-roblox-no-hack_GM431946152.pdf
    • http://library.atim.ac.id/repository/coin-master-hacked-apk-download-for-android_GM406889139.pdf
    • http://library.atim.ac.id/repository/roblox-hack-download-mac-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/elysian-roblox-hack-download_GM431946152.pdf
    • http://library.atim.ac.id/repository/comment-gagner-des-robux-sans-hack_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-get-free-tiktok-followers_GM835599320.pdf
    • http://library.atim.ac.id/repository/how-to-edit-roblox-hacks_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033de.bin
52625975a0264027d09866b1751edb5785eabd01131919d36c6a8c5850407fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33DE 22560 bytes
font_01_sfnt_off0000663c.bin
f98b14fa014d7e4f340675e0a40dd89d5d834238fa4c598c163f2051dae61cd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663C 18176 bytes

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