Malicious PDF — malware analysis report

Static analysis result for SHA-256 279643102125e7f6…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 08:10:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1f8b94266eae1649e2483310184f6d3c SHA-1: 53e9edf7ee8d4a524db336c206400dc6c63ee068 SHA-256: 279643102125e7f6ce8b8e487177e35eebe83a0adef581a7fe83c17fecb6423a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as a link farm for SEO purposes, promoting game hacks and free in-game currency. The document body and extracted URLs suggest a lure for users seeking 'free Robux' or similar game exploits. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent.

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.online/app/431946152/how-to-get-free-robux-as-a-kid-game-hack
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-app_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/how-to-win-free-robux_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/roblox-script-hacks_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/are-pubg-uc-available_GM1330123889.pdf
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/mcpe-master-coins-hack-download_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/coin-master-game-2021-free-spin-link_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/how-you-get-free-robux_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/free-spins-coin-master-links_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/minecraft-xbox-one-code-free_GM479516143.pdf
    • http://katalog.gemalibrary.net/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/moonactive-free-spins_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/is-roblox-studio-free_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/coin-master-free-mighty-lion-card_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/coin-master-free-raid-link_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/free-roblox-accounts-with-robux_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/coin-master-free-link_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/minecraft-112-hacked-client_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005185.bin
11b7ce057cccd785e6f6ab51f1f578e50bd9196495efea3676cc6878bf941dc0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5185 27796 bytes
font_01_sfnt_off000090a5.bin
4c8bb362127e72cdfb7b8bc61e06feb9a8380d66f35d9d696249482728f37543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90A5 18576 bytes

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