Malicious PDF — malware analysis report

Static analysis result for SHA-256 19255562d83052f6…

MALICIOUS

PDF

36.0 KB Created: 2021-07-06 16:31:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d762238f0f908cb598fa7365992fe8bb SHA-1: 95d9a47e217b00b31077573365868f3d3f989a45 SHA-256: 19255562d83052f6bd3457f797d415413c4543ea1956171d514ef5391e991fdc
122 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to other PDF files hosted on the IP address 110.78.114.242. The document body and extracted URLs suggest a lure related to free in-game currency or accounts for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting this document is part of a link farm designed to drive traffic to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.
  • 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 http://netcdn.tw/app/431946152/how-to-get-free-robux-without-downloading-apps-2021-game-hack
    • http://110.78.114.242/ckfinder/userfiles/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-get-free-minecraft-alts_GM479516143.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/coin-master-daily-free-coins-link-today_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/coin-master-free-coin-and-spin-app_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/minecraft-mod-menu_GM479516143.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/coin-master-free-cards-link-2021-today_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/roblox-zone-free-robux_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/coin-master-hack-apk-2021-ios_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-download-minecraft-for-free_GM479516143.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/coin-master-hack-spin-160-pro_GM406889139.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/free-robux-co_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/hack-cuenta-roblox-2021-pastebin_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/robux-xyz_GM431946152.pdf
    • http://110.78.114.242/ckfinder/userfiles/files/www-roblox-com-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000301d.bin
bb6bf68ae21532b25e0ba6977871dd226ad1714e9b5934e7c17bc779b5c1eb0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x301D 23072 bytes
font_01_sfnt_off00006349.bin
bbee3cd2d045934f3587faaae269c5438879465e49c598d076b35cc198d7b491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6349 20464 bytes

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