Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f37e3265a271b39…

MALICIOUS

PDF

41.2 KB Created: 2021-05-13 22:32:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ff20cd81d3092ef452c7e3a946dfb501 SHA-1: a772821b19b6ad592ece8280d515339b1b89f62c SHA-256: 8f37e3265a271b39c0e08c51348e6ecb6a5219895f5c8eda009ac36c830db9db
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 SEO-optimized PDF gateways for game cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of embedded URIs and a link farm suggests an attempt to redirect users to malicious content or phishing sites. The document body, though partially corrupted, contains a title related to hacking for Robux, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/how-to-hack-to-get-robux-game-hack
    • http://www.sovtigaz.ru/f/files/coin-master-hack-ios-app_GM406889139.pdf
    • http://www.sovtigaz.ru/f/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdf
    • http://www.sovtigaz.ru/f/files/free-daily-coin-master-coins_GM406889139.pdf
    • http://www.sovtigaz.ru/f/files/how-to-get-free-coins-in-coin-master-game_GM406889139.pdf
    • http://www.sovtigaz.ru/f/files/free-robux-accounts-2021_GM431946152.pdf
    • http://www.sovtigaz.ru/f/files/free-robux-without-doing-anything_GM431946152.pdf
    • http://www.sovtigaz.ru/f/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • http://www.sovtigaz.ru/f/files/blox-world-free-robux_GM431946152.pdf
    • http://www.sovtigaz.ru/f/files/robloxheroxyz-free-robux_GM431946152.pdf
    • http://www.sovtigaz.ru/f/files/coin-master-hack-blog_GM406889139.pdf
    • http://www.sovtigaz.ru/f/files/how-to-get-minecraft-for-free_GM479516143.pdf
    • http://www.sovtigaz.ru/f/files/roblox-pink-free-robux_GM431946152.pdf
    • http://www.sovtigaz.ru/f/files/master-coins-free_GM406889139.pdf
    • http://www.sovtigaz.ru/f/files/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://www.sovtigaz.ru/f/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdf
    • http://www.sovtigaz.ru/f/files/coin-master-invite-friends-hack_GM406889139.pdf
    • http://www.sovtigaz.ru/f/files/free-robux-hack-2021_GM431946152.pdf
    • http://www.sovtigaz.ru/f/files/free-spin-link-coin-master-today_GM406889139.pdf
    • http://www.sovtigaz.ru/f/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • http://www.sovtigaz.ru/f/files/robux-hack-generator_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000473e.bin
0556565bfcae2c77c97d6c35aa0d8b5a8ac42a2e383d7027c9c6de439b066f42
pdf-font-stream PDF embedded font (sfnt) at offset 0x473E 23860 bytes
font_01_sfnt_off00007daf.bin
e2a97b64806b22db336191728b408e5b7179700d4ee5fd3b4b30addea2706a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAF 18516 bytes