Malicious PDF — malware analysis report

Static analysis result for SHA-256 de23a050b9009cb2…

MALICIOUS

PDF

49.5 KB Created: 2021-06-10 17:19:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7193482669583e81435b73213d87c25d SHA-1: ab0eaf7ad35d8acf765dee2bdf22e19ade70340c SHA-256: de23a050b9009cb2a7000e1d178b6aadc4db17d3741fed8a408be37639e9d081
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are disguised as links to game-related content such as Roblox and Coin Master. The heuristic PDF_SEO_LINK_FARM indicates a large number of these links, suggesting a link farm or a method to distribute malicious content. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/roblox-clover-online-cheat-game-hack
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/roblox-free-items_GM431946152.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/minecraft-free-download-no-virus_GM479516143.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/roblox-premium-free_GM431946152.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/how-to-get-free-robux-actually-roblox_GM431946152.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/roblox-when-bloxburg-will-be-free_GM431946152.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/coin-master-free-spins-gratis_GM406889139.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/coin-master-hack-no-root_GM406889139.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/free-robux-safe_GM431946152.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/how-to-actually-get-free-robux_GM431946152.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/nasl-roblox-a-cheat-engine-dan-hile-yapilir_GM431946152.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/get-coin-master-hack_GM406889139.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/roblox-free-pets_GM431946152.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/how-to-hack-all-faces-in-roblox_GM431946152.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/free-robux-giveaway-live_GM431946152.pdf
    • http://alazhar-university.ac.id/aplikasi/perpustakaan/repository/how-to-get-free-clothes-on-roblox-on-your-phone_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005463.bin
5b7fc63b2bd9e12070be716aca28e9325fdf2ca6acf332eeaac667f7ecc2abbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5463 26256 bytes
font_01_sfnt_off00009125.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9125 5696 bytes
font_02_sfnt_off00009e37.bin
67b0f57dd5932724ced1381fb452bc09632d47ac3623efe92895ba0f3b1ac7f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E37 18516 bytes

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