Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5429875343f8a1…

MALICIOUS

PDF

35.5 KB Created: 2021-07-09 03:15:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c5a0399b72752bc7378bb56fcf42fa76 SHA-1: e2515674aaec96c9be16d1e252d2848dc65ffc55 SHA-256: ac5429875343f8a1031c3732f445cee77d022b1094cd17c10daac0c6bc316d1e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, identified as a link farm, suggesting a tactic to manipulate search engine results or direct users to potentially malicious content. The document body, though partially corrupted, contains references to game cheats and hacks, aligning with the heuristic findings of a link farm and external URI. No scripts were extracted, but the presence of many external links indicates a likely attempt to redirect users to phishing or malware hosting sites.

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/406889139/free-spins-coin-master-no-survey-game-hack
    • http://dev.pmrscambodia.org/images/uploadfiles/cheats-coin-master-free_GM406889139.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-spins-link-download_GM406889139.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/only-you-little-mix-cheat-codes-roblox-id_GM431946152.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-hack-spins-download_GM406889139.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-how-to-get-unlimited-free-robox-2021_GM431946152.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-mod-version-free-download-v344_GM406889139.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/show-me-how-to-get-free-robux_GM431946152.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/free-coins-coin-master-spins_GM406889139.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/2021-coin-master-hack_GM406889139.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/fly-hack-in-roblox_GM431946152.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/free-coin-master-spin-app_GM406889139.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/free-spins-coin-master-2021-app_GM406889139.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/sites-for-free-spins-for-coin-master_GM406889139.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/can-you-change-your-name-on-roblox-for-free_GM431946152.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-working-generator-2021-no-verification_GM431946152.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-robux-easy_GM431946152.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-spins-link-facebook-page_GM406889139.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/nike-roblox-shirt-free_GM431946152.pdf
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-free-stuff-catalog_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003366.bin
5061a1fa14eda78a5c03f6547f24aebfce0663feccb25e4cd4a4c26ef9f350ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3366 23076 bytes
font_01_sfnt_off0000675c.bin
680cafe8e4b1b393f295b34d6fcd5460ee3344c8993a72aaa8a95020f58f412b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675C 18608 bytes

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