Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda6fd696b8e58c2…

MALICIOUS

PDF

34.7 KB Created: 2021-06-30 17:37:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 923ce8ddbded719f64b9943e66f7c0d3 SHA-1: a99ab2632c49733e41fb2057aa733d151dfebcbf SHA-256: cda6fd696b8e58c266912d5dc31d61454c1a16cc3366e19a931464b128fa95ee
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a 'download button' lure, all related to obtaining free Robux, a common lure for phishing and malware distribution. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links suggests a link farm designed to redirect users to malicious sites. No scripts were extracted, but the overall structure and content point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://netcdn.co/app/431946152/free-robux-ios-2021-game-hack
    • http://opac.disarpus.surakarta.go.id/repository/rblx-city-free-robux_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/login-robux_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-roblox-password-with-robux_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-hack-on-phone_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-on-roblox-jailbreak-2021_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-roblox-gift-card-codes-2021-november_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/how-to-gfet-cheat-engine-to-work-with-roblox_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-codes-2021_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/bad-business-cheat-roblox_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-daily-1-ga_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/money-hack-restaurant-tycoon-roblox_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/can-you-get-robux-for-free_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-coins-app_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/deadly-sins-online-roblox-working-hack_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-coins-for-flip-master-online_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/get-free-robux-no-human-verification_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-lucky-patcher-hack_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/hacks-to-get-free-robux_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-clothing-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003069.bin
381967c24337e0c153df99d0856a94931d70e6af1324a7fb6a44e990427337ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3069 22416 bytes
font_01_sfnt_off00006267.bin
4a5c13b7083f6c05d3af1616474ca685b6fa49aa12efde04a316df3e39e97674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6267 19116 bytes

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