Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f225aafd0a67951…

MALICIOUS

PDF

44.4 KB Created: 2021-06-09 11:08:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 19fb8a8733c4a1ff1d01d2e6e11beac9 SHA-1: c8ccbfe919e6fe8ac761d5144b79f81f7f242861 SHA-256: 5f225aafd0a679517031e7c4076321ebea0db1b581f390d081a3f10c673c018d
102 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a tactic to manipulate search engine results or direct users to potentially malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to entice clicks. While no scripts were extracted, the ML classifier and the link farm heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/alsotheking-roblox-hacker-game-hack
    • http://library.fikes.upnvj.ac.id/repository/pro-free-spins-coin-master_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spin-sites_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/robux-websites-2021_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-accounts-not-banned_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/2021-how-to-make-a-free-group-in-roblox_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/cheat-codes-for-coin-master_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-tiktok-like_GM835599320.pdf
    • http://library.fikes.upnvj.ac.id/repository/where-to-get-free-tiktok-likes_GM835599320.pdf
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-fb_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/minecraft-free-education_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-minecraft-maps-pe_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-unlimited-spins-apk_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-coin-master-account_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/coin-master-spin-hack-2021_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/how-to-hack-people-in-roblox_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/games-in-roblox-that-give-you-robux_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/how-to-hack-any-game-on-roblox-with-cheat-engine_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ee2.bin
1a3f0e39b78102b7cd9f0e7f1a6bfca6ba49bcd135fc9e5282cde372e6d1bdfe		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE2 25352 bytes
font_01_sfnt_off00008910.bin
09a2e4c0b4ee36fadc875c95cc2c99647e0202262d91f008f1e1c43c3624fa90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8910 18860 bytes

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