Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2ec0733b4f1e1b…

MALICIOUS

PDF

35.4 KB Created: 2021-06-30 03:35:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b987e2857c0b5b4d8a7127b93cb49726 SHA-1: c436faecaf2df301b1b5b7b834b910200c334894 SHA-256: 7c2ec0733b4f1e1b09d19a1475a80b2e93550348edc8933aed9f0c68160342b3
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous embedded URLs and a 'link farm' structure, suggesting it is designed to redirect users to malicious sites. Heuristics indicate social engineering tactics, specifically 'ClickFix', which prompt users to execute commands via Win+R or a terminal. This strongly suggests the document is a lure to trick users into downloading and executing a second-stage payload, likely from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.co/app/431946152/free-robux-please-work-game-hack
    • http://opac.disarpus.surakarta.go.id/repository/check-it-out-free-cellphones-roblox_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/lazyblocks-com-free-robux_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-link-today_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/earn-free-robux-on-roblox_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-bc-on-roblox-2021_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/roblox-server-shutdown-hack_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/how-to-earn-free-spins-coin-master_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/roblox-games-that-give-you-free-stuff_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-rare-cards-hack_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/omg-free-robux_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/no-survey-no-human-verification-free-robux_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/roblox-kick-ban-hack_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-roblox-clothes-event-2021_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-in-any-roblox-account-2021_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-hack-2021-may_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-sites-that-work_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/how-to-change-your-name-on-roblox-for-free_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-roblox-games-without-cheat-engine-2021_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/roblox-how-to-sell-a-t-shirt-for-free_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003235.bin
2270dcfdff08d831f093761d38ab6999a7ab42f75a6c83e1af5cee1e75a8cd71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3235 22612 bytes
font_01_sfnt_off000064cc.bin
2eca74da5653d4b1740d7c2be8495fa129e8ac7637727322fb0f4ce0306448fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CC 19312 bytes

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