Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c32a953b8121a43…

MALICIOUS

PDF

44.3 KB Created: 2021-05-16 13:33:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8445ec391fc2ec90b435902073ba1f5b SHA-1: 54c5b32bae3aea21a7f390a6ddaa4ae64a630955 SHA-256: 1c32a953b8121a431d2fef67525ebfcb3fcc923ea228e47ebf1d6178337d1c03
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a link farm, directing users to external websites that offer 'free spins' or 'free robux'. The ML classifier strongly indicated maliciousness, and the presence of multiple SEO-linked PDFs suggests a campaign to drive traffic to potentially malicious or phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure for users to click through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/406889139/coin-master-free-spins-and-free-coins-game-hack
    • http://www.gyfunnews.com/ckfinder/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/robux-app_GM431946152.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/roblox-character-free_GM431946152.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/how-to-make-free-robux_GM431946152.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/hack-coin-master-dzooka_GM406889139.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/cheats-coin-master-free-spins-and-news_GM406889139.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-printable-roblox-coloring-pages_GM431946152.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/coin-master-free-spins-coins_GM406889139.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/coin-master-daily-free-cards_GM406889139.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/rewardrobux-com_GM431946152.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/coin-master-daily-spin-free_GM406889139.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/freerubux_GM431946152.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-coins-coin-master-hack_GM406889139.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/coin-master-free-cards-link_GM406889139.pdf
    • http://www.gyfunnews.com/ckfinder/userfiles/files/gamehunters-club-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048d8.bin
f1656f00c434e39d7c3e37d63ef230250b6e99e24ffd3c658a58b75e377c5858		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48D8 24588 bytes
font_01_sfnt_off00008154.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8154 2840 bytes
font_02_sfnt_off00008b06.bin
7f8980b6f3213b204c7b050e62c653166806b65682437d624869b2fc7a4cb6a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B06 18060 bytes

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