Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7cf37ecf5d30fb…

MALICIOUS

PDF

45.3 KB Created: 2021-06-10 17:48:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 36014f040c6b01015faad36b812fa867 SHA-1: d78e058499773211d7d0fa46ed990d60a95cad9d SHA-256: fb7cf37ecf5d30fb1cb72c25d773103b0cbb31d3cfab85347af09ce53847577c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are related to game cheats and rewards, indicating a link farm or phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous embedded URLs suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/how-to-use-cheat-engine-on-roblox-2021-game-hack
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-daily-rewards_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/why-does-roblox-shut-down-when-i-use-cheat-engine_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-robux-no-survey_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/how-can-you-get-free-robux_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-100-robux_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-rare-cards-hack_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/hacks-for-roblox-v5-fast-and-furious-updates_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/coins-master_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-coins-coin-master-link-today_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/hack-robux-using-google-chrome_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/how-to-earn-free-robux-2021_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-game-hack-link_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-without-downloading-anything_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/minecraft-hack-client-18-9_GM479516143.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-no-human-verification-2021-generator_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/spiele-hacken-pc-robux_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-gift-link-2021_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-spins-2021-today_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-robux-legit-november-2021_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/hacked-roblox-game_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005266.bin
5afe949f83754e4a2c45f436873f4450731ff45f498bc6d9e80f25ea257c0cca		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5266 24392 bytes
font_01_sfnt_off00008aa2.bin
7dd061c360622dbe2e444b2d7e7a98d9c75ef28844c531c1ae721f995fa3fb06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA2 19444 bytes

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