Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a06df6d8f80405…

MALICIOUS

PDF

42.5 KB Created: 2021-05-14 17:33:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 598a06b1ee9dd4e1bcbed6643a36c1ca SHA-1: 12cf8fa0ac1e152e0b110e8fa939f936bc91439e SHA-256: d0a06df6d8f804056551dbcb3b1152ba06dfb2c51755b157d2f0fe69353cce4f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified as a link farm, likely for SEO manipulation or to redirect users to malicious sites. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-coin-master-spins-blog-game-hack
    • http://kalaydova.com/images/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://kalaydova.com/images/how-to-get-coin-master-card-free_GM406889139.pdf
    • http://kalaydova.com/images/coin-master-free-spins-hack-apk-download_GM406889139.pdf
    • http://kalaydova.com/images/can-you-host-a-minecraft-server-for-free_GM479516143.pdf
    • http://kalaydova.com/images/free-robux-no-human-verification-generator_GM431946152.pdf
    • http://kalaydova.com/images/minecraft-java-account-free_GM479516143.pdf
    • http://kalaydova.com/images/coin-master-free-spins-facebook_GM406889139.pdf
    • http://kalaydova.com/images/coin-master-home_GM406889139.pdf
    • http://kalaydova.com/images/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://kalaydova.com/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://kalaydova.com/images/free-coin-master-spins_GM406889139.pdf
    • http://kalaydova.com/images/coin-master-hack-app-download-free_GM406889139.pdf
    • http://kalaydova.com/images/coin-master-free-coins-app_GM406889139.pdf
    • http://kalaydova.com/images/coin-master-server-hack_GM406889139.pdf
    • http://kalaydova.com/images/how-to-get-roblox-credit-for-free_GM431946152.pdf
    • http://kalaydova.com/images/how-to-get-free-skins-in-roblox_GM431946152.pdf
    • http://kalaydova.com/images/giftrobux-com-generator_GM431946152.pdf
    • http://kalaydova.com/images/earn-robux-today_GM431946152.pdf
    • http://kalaydova.com/images/free-spins-coin-master-links_GM406889139.pdf
    • http://kalaydova.com/images/how-to-make-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004917.bin
d25d9ce2e733d761ec1bccae36cccffb9519f60bbcad8f07e6e70c22d9c27b32		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4917 25120 bytes
font_01_sfnt_off0000836f.bin
a2c76306a813766f02d16bba13a6176cc917de49c90529db8e6e2ffa1e8149db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836F 18464 bytes

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