Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c7e58117bdba84…

MALICIOUS

PDF

34.7 KB Created: 2021-06-26 08:57:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8adbe852911cec467086eeb98e1eb8a8 SHA-1: 712fc06391b4335626a857cf945a83fc112a6a2d SHA-256: 49c7e58117bdba842917734d141947a6d1828c897de2cc70d3b96a2b07ceea0e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or content aggregation tactic. The primary URL, http://netcdn.co/app/431946152/free-dominus-roblox-2021-game-hack, likely serves as a lure for downloading malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

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-dominus-roblox-2021-game-hack
    • https://kldcardio.ru/images/cute-roblox-outfits-for-girls-and-for-free_GM431946152.pdf
    • https://kldcardio.ru/images/free-roblox-skin-generator_GM431946152.pdf
    • https://kldcardio.ru/images/coin-master-game-2021-free-spin-link_GM406889139.pdf
    • https://kldcardio.ru/images/free-running-in-parkour-roblox_GM431946152.pdf
    • https://kldcardio.ru/images/how-to-get-a-free-epic-face-on-roblox_GM431946152.pdf
    • https://kldcardio.ru/images/how-to-download-minecraft-for-free-on-mac_GM479516143.pdf
    • https://kldcardio.ru/images/hacking-a-roblox-scammer_GM431946152.pdf
    • https://kldcardio.ru/images/play-roblox-for-free-online-now_GM431946152.pdf
    • https://kldcardio.ru/images/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://kldcardio.ru/images/coin-master-free-spins-2021_GM406889139.pdf
    • https://kldcardio.ru/images/free-tiktok-accounts-with-followers_GM835599320.pdf
    • https://kldcardio.ru/images/earn-free-robux-for-roblox_GM431946152.pdf
    • https://kldcardio.ru/images/free-24-7-minecraft-server_GM479516143.pdf
    • https://kldcardio.ru/images/free-robux-websites-2021_GM431946152.pdf
    • https://kldcardio.ru/images/free-roblox-mobile-robux-hack_GM431946152.pdf
    • https://kldcardio.ru/images/how-to-get-free-cash-in-boku-no-roblox_GM431946152.pdf
    • https://kldcardio.ru/images/pubg-uc-2021_GM1330123889.pdf
    • https://kldcardio.ru/images/roblox-cheats-for-robux-and-tix-2021_GM431946152.pdf
    • https://kldcardio.ru/images/como-hackear-cualquier-cuenta-de-roblox_GM431946152.pdf
    • https://kldcardio.ru/images/free-spin-coin-master-new-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fa7.bin
354eed131988ece451c7b659665e169401ccba5572e58d88ba10209188825a07
pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA7 22136 bytes
font_01_sfnt_off0000607e.bin
bc3de830e0ffe8b271a833a4bbca4f6a6eefc11862369c30525d5d958a32100d
pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 19740 bytes