Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa31e4d6f3a6e9e7…

MALICIOUS

PDF

44.9 KB Created: 2021-05-12 22:31:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c1c216b86a06a39454cf17d5060c48c5 SHA-1: 77e895dda46e79abe277c22e048f3617b50df809 SHA-256: fa31e4d6f3a6e9e7097c3972a540726de024f2182c37e24e18af2f94567cbd35
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that form a link farm, primarily promoting game hacks and cheats for titles like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to redirect users to potentially harmful content or applications. The ML classifier also strongly flagged this PDF as malicious.

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/406889139/coin-master-free-spin-and-coin-game-hack
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-hack-apk-no-survey_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-spins-coins-coin-master_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/toolbox-for-minecraft-ios_GM479516143.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/oprewards-com-robux_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-you-get-robux_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/minecraft-hacked-client-download_GM479516143.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-more-robux-for-free_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-robux-no-human-verification-or-survey_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-rewards-2021_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/hacks-for-coin-master_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-spins-on-coin-master-generator_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/does-coin-master-hack-work_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/master-coin-free-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004fe3.bin
23011cadcdbb250983cc92286ffef0143d31c0b9e34f52cd8aac142aed31c11d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE3 29544 bytes
font_01_sfnt_off00008e17.bin
7f8980b6f3213b204c7b050e62c653166806b65682437d624869b2fc7a4cb6a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E17 18060 bytes

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