Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a740b111342ddc…

MALICIOUS

PDF

43.1 KB Created: 2021-05-19 11:06:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d99ddebed2b74b9faa32867bd52875af SHA-1: c89cc10552aec1f3225bf99c325268110de3e15f SHA-256: b8a740b111342ddc55ea6aede417ee2fafa7405d97ee939fac462bf11fe025fc
122 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to IP addresses, and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, contains references to game-related downloads, suggesting a lure to trick users into downloading further malicious content. The presence of numerous PDF links and the IP literal heuristic indicate a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/roblox-2021-game-hack
    • http://110.78.114.242/ckfinder/userfiles/files/games-that-give-free-robux_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/real-minecraft-for-free_GM479516143.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/minecraft-hax-download-no-virus_GM479516143.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/pasos-para-hackear-coins-master_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/coin-master-mod-version-free-download-34-4_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/free-spins-coin-master-site-wwwquoracom_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/roblox-premium-free_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/inr-to-uc-pubg_GM1330123889.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/real-roblox_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/hack-coin-master-2021_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-hack-coins-in-mcpe-master_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-do-you-get-free-roblox-money_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/coin-master-free-spin-ml_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/roblox-free-robux-website_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/minecraft-server-hacks_GM479516143.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/free-robux-hacker-us_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b0e.bin
039c8646fc6a1e2ca390c7a8b9f21d84f49c579bff9af4a4bc7854ee2b817dfa		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B0E 25800 bytes
font_01_sfnt_off00008629.bin
6cca9372861d076cf8d3c2867e7e5d9b17d028f57adcd6414208106954a37e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8629 18184 bytes

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