Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1139a7c3e4219d…

MALICIOUS

PDF

45.1 KB Created: 2021-05-12 05:11:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ba563ddc1c3aadcf876d3cb944d3976b SHA-1: 6aba8aebab3fa3931bd5af62aee9e84ffc35d149 SHA-256: 2d1139a7c3e4219dbe27a4b1ec96a82f756d62339181db32511d0260cfecd718
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and a large number of external links, many of which are SEO-optimized and point to gaming-related freebies. The primary URL, https://netcdn.xyz/app/431946152/free-robux-working-game-hack, suggests a scam or phishing attempt. The presence of numerous PDF links indicates a link farm designed to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-robux-working-game-hack
    • http://hometech.tw/ckfinder/userfiles/files/free-spins-for-coin-master_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-meme_GM431946152.pdf
    • http://hometech.tw/ckfinder/userfiles/files/free-online-games-like-minecraft_GM479516143.pdf
    • http://hometech.tw/ckfinder/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdf
    • http://hometech.tw/ckfinder/userfiles/files/free-coin-master-account_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/get-roblox-for-free_GM431946152.pdf
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-hacks-free-spins_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/blox-world-free-robux_GM431946152.pdf
    • http://hometech.tw/ckfinder/userfiles/files/roblox-hack-me_GM431946152.pdf
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-rewards_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/blogger-coin-master-free-spins_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/how-to-get-free-skins-on-coin-master_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • http://hometech.tw/ckfinder/userfiles/files/minecraft-windows-10-edition-hacked-client_GM479516143.pdf
    • http://hometech.tw/ckfinder/userfiles/files/free-coin-master-links_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/easy-free-spins-coin-master_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/minecraft-pe-015-0-apk-free-download_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b51.bin
7f0ae31f1a3e26fd5f0ae8169655804e0eaac4cf2528ffb4b2fca8392b4d4a37		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B51 28544 bytes
font_01_sfnt_off00008c8f.bin
146362cb081aa7c6718ebc51132ca2538876dc1922f8d33668898621d3d02efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8F 18788 bytes

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