Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77b9f686d90f995…

MALICIOUS

PDF

44.7 KB Created: 2021-05-16 16:07:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fd23ffe50a5f99ad535ac6fc24351828 SHA-1: 4d27ed1281bf1891949cf6d1ff8d8fcdce6e4653 SHA-256: b77b9f686d90f9952e9ac1fa492ea9b8f1e2cfcb98366318c259270bdcf97d87
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to other PDF files hosted on the same domain, suggesting a link farm or redirection scheme. The document body explicitly mentions 'Free Robux' and includes a URL that promises 'free-robux-no-human-verification-or-survey-or-download-game-hack', indicating a lure for potentially malicious downloads or scams. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-robux-no-human-verification-or-survey-or-download-game-hack
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/robux-free-online_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/coin-master-online-hack-download_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/worst-roblox-avatars_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-hack-a-minecraft-account_GM479516143.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-get-free-robux-app_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-get-java-minecraft-for-free_GM479516143.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/robux-hack-generator_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-coin-master-link-2021_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-robux-sites-that-work_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/moonactive-coin-master-free-spins_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-roblox-toys_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-free-robux_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-hack-in-roblox-prison-life_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-spins-coin-master-ios-2021_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/mcpe_GM479516143.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b89.bin
6102ad173daf0584698ff623184433e68ee0521415800224b451604952a32aff		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B89 25776 bytes
font_01_sfnt_off0000881e.bin
59e4374f8172b973ba9217c83b5ce6b26483f5ae1ceeffd331798f57e1658bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881E 19736 bytes

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