Malicious PDF — malware analysis report

Static analysis result for SHA-256 a823d7a8d088b6d7…

MALICIOUS

PDF

33.4 KB Created: 2021-07-03 17:27:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f0cbbc1d56cc3d1bd10866ea8ad6effa SHA-1: 29e1cfe5104a4352a0955f8f0a0f3763fb7c7401 SHA-256: a823d7a8d088b6d798aa030466d95f003bc880bd767237b9a579a32d19cd4091
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a link farm, strongly suggesting it is designed to redirect users to malicious websites. The ML classifier and PDF link farm heuristics indicate a high likelihood of malicious intent, likely to deliver a second-stage payload or phish for credentials. The document body and extracted URLs promote free game items, a common lure for such attacks.

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 http://netcdn.tw/app/479516143/minecraft-java-edition-free-game-hack
    • https://www.yatrikathmandusuite.com/userfiles/files/free-spins-and-coins-coin-master-links_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-robux-pins_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/roblox-hackprogamers-com_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/easy-robux-generator_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/roblox-hacks-com_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-hack-apk-iphone_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-hack-a-minecraft-server_GM479516143.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/roblox-redeem_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-roblox-premium-for-free_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-roblox-hair-boy_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-apk-mod-free-download_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/robux-free-robux_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/minecraft-pe-server-hosting-free_GM479516143.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f8d.bin
3d0f84a393367696999245d7b521f65e6b9377c5c5240785215d68b3117fbc14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F8D 21812 bytes
font_01_sfnt_off00005f65.bin
c88fc963111c99bd76411e48cc5f7a93ca1ac40d038cb8251833f774ecd296b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F65 18452 bytes

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