Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb491c8abd57858…

MALICIOUS

PDF

37.6 KB Created: 2021-06-27 03:24:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7cce2159f2efad94e49666bafe96e478 SHA-1: 73c079325423df4ca87c113dd14633f224406c27 SHA-256: 4cb491c8abd578580a3b256b8419f9185cc759d72c1d4187583880882b7be69e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are SEO-optimized and point to game-related hacks and free items, suggesting a lure to download malicious content. The presence of a download button heuristic further supports this malicious intent. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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/how-to-hack-roblox-with-winrar-pc-game-hack
    • http://lib.vipklh.ru/repository/roblox-hack-rebirth-in-ice-cream-simualtor_GM431946152.pdf
    • http://lib.vipklh.ru/repository/roblox-lumber-tycoon-2-hacked-version_GM431946152.pdf
    • http://lib.vipklh.ru/repository/free-stacked-roblox-arsenal-account_GM431946152.pdf
    • http://lib.vipklh.ru/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdf
    • http://lib.vipklh.ru/repository/bux-free-robux_GM431946152.pdf
    • http://lib.vipklh.ru/repository/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://lib.vipklh.ru/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://lib.vipklh.ru/repository/roblox-jailbreak-hack-apk-download_GM431946152.pdf
    • http://lib.vipklh.ru/repository/roblox-free-dominus-hat_GM431946152.pdf
    • http://lib.vipklh.ru/repository/red-cropped-top-and-ripped-jeans-roblox-outfit-free_GM431946152.pdf
    • http://lib.vipklh.ru/repository/free-robux-codes-2021-not-used_GM431946152.pdf
    • http://lib.vipklh.ru/repository/how-to-get-things-for-free-on-roblox_GM431946152.pdf
    • http://lib.vipklh.ru/repository/jojo-characters-on-roblox-free_GM431946152.pdf
    • http://lib.vipklh.ru/repository/free-robux-giveaway_GM431946152.pdf
    • http://lib.vipklh.ru/repository/minecraft-pe-apk_GM479516143.pdf
    • http://lib.vipklh.ru/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdf
    • http://lib.vipklh.ru/repository/how-to-get-unlimited-robux_GM431946152.pdf
    • http://lib.vipklh.ru/repository/how-to-get-free-robux_GM431946152.pdf
    • http://lib.vipklh.ru/repository/free-roblox-account-with-all-elements-on-elemental-battlegrounds_GM431946152.pdf
    • http://lib.vipklh.ru/repository/youtubecom-ultraw-free-robux_GM431946152.pdf
    • https://www.roblox.com/.I
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003ab3.bin
0b728329f266031f7a2b7a9d592ccc51fb25fa5dae54705ae0668c242670d19a
pdf-font-stream PDF embedded font (sfnt) at offset 0x3AB3 22516 bytes
font_01_sfnt_off00006c88.bin
77c0f0854be1dc5d02bf6f66a9e62fddb2d1e3db9410b81debb218bfde785d20
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C88 19564 bytes