Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d55b3f65fe75d10…

MALICIOUS

PDF

35.5 KB Created: 2021-07-01 06:32:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7f75fbe1fc201e48e39a63d76ec04586 SHA-1: b59ae98daedbe9ffe5cd6b32b22efee63367302b SHA-256: 2d55b3f65fe75d10a703ea42c2ecce3ba48b1e69b1c62673044797f6bd39ff6c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a 'download button' lure, all related to obtaining free Robux or game hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the content strongly suggest an attempt to redirect users to malicious sites for potential malware download or phishing.

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.co/app/431946152/free-robux-2021-pc-game-hack
    • http://library.itekes-bali.ac.id/repository/roblox-com-for-free-robux_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/new-hack-for-roblox-deathrun-2021-november-pc_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/free-roblox-screen-recorder_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/free-robux-without-human-verification-or-downloads_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/minecraft-for-chromebook-free_GM479516143.pdf
    • http://library.itekes-bali.ac.id/repository/wie-kann-man-free-robux-kriegen_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/roblox-free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/roblox-hack-deutsch-pc-2021_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/download-roblox-free-full-version_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/coin-master-game-free-spin_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/minecraft-free-no-download_GM479516143.pdf
    • http://library.itekes-bali.ac.id/repository/robux-2021-free_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/asshurt-roblox-exploit-free_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/how-to-hack-theme-park-tycoon-2-roblox_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/free-cheat-codes-for-coin-master_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/coin-master-hacks-that-actually-work_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/hack-para-counter-blox-roblox-offensive_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-roblox-game-passes-not-patched_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003391.bin
0ee21abe4e9de669e620cebe20a2f69827e3ea600efc085da4856f7d0c2f677e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3391 22312 bytes
font_01_sfnt_off00006538.bin
76d65d5fe5e08aa7e1c3783895363f59a24a15699196a3f4acc3b35873c825dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6538 19272 bytes

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