Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb65652a877fb83f…

MALICIOUS

PDF

45.9 KB Created: 2021-06-07 15:44:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8fa362e866e37c14c3a16c565e7223a6 SHA-1: 8e7dc5e0579406c488f6b2118d5faca56683e34b SHA-256: eb65652a877fb83f141f0ba14837cab255b6945381445ce3a6d87e1a5e7acbdb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or content aggregation tactic. The primary URL points to 'roblox-avatar-ideas-free-game-hack', indicating a lure for free game-related content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the sheer volume of external links and the nature of the lures suggest an attempt to drive traffic to potentially malicious sites or downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-avatar-ideas-free-game-hack
    • https://kupinapopust.mk/pub/img/userfiles/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-hack-app-2021_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/what-is-coin-master-app_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/how-to-get-free-robux-without-email_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/free-robux-redeem-codes_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/free-robux-download_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/free-robux-generator-2021_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/free-robux-without-downloading-anything_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-in-app-purchase-hack_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/tiktok-likes-free_GM835599320.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-hack_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/websites-to-get-free-robux_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/windows-10-minecraft-free-with-java_GM479516143.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-for-pc-free-download_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005270.bin
e11f7861732ced546e2ce30cce3b36a5b420120fdbf3b3550182c40659cef7ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5270 27980 bytes
font_01_sfnt_off0000900a.bin
44b7e510f382645a86a02c70f5bb89fe95c0bf46c25cfeb36ccf5b4bda15a100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x900A 18568 bytes

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