Malicious PDF — malware analysis report

Static analysis result for SHA-256 247e9755b4565203…

MALICIOUS

PDF

42.6 KB Created: 2021-05-16 07:36:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 10d49a2a23d79df611cd7ad72a8dce7a SHA-1: 948239c2f7fbefe4341dfaea6ae53e7805d66c0b SHA-256: 247e9755b4565203c12209610820788e1f7847df077c0c9bd0fd828130c0d3b7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to other PDFs hosted on serraw.com, which collectively form a link farm. One of the primary links directs to a URL that appears to be a lure for free Robux codes. The ML classifier strongly indicated maliciousness, and the presence of a call-to-action button further supports a phishing or scam attempt.

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/real-free-robux-codes-game-hack
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-com-free-robux_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/daily-free-spins-on-coin-master_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/robuxy-com-generator_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-fun-com-robux_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/coinmaster-hack_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/earn-robux-by-watching-ads_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-free-blogspot_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/free-coins-for-flip-master-online_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/get-free-robux-com_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-root-hack_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-hacks-for-iphone_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004996.bin
6d35fc909d89e4efe6fdc11fb8870b8d49ba28b59bbd942e04dcbfbc0ec1adee		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4996 24972 bytes
font_01_sfnt_off00008363.bin
6ff68d48ac5036b960fd78490347d8f271b820cb13d1967b9212c8abd8834c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8363 18492 bytes

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