Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25d01dc7879ed0b…

MALICIOUS

PDF

43.5 KB Created: 2021-05-11 08:39:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 29f5627bee58eb08fdf6a581e6f0cc1a SHA-1: 52b74ce7261661d9f7880817b439aeb0f00efe89 SHA-256: a25d01dc7879ed0b2ed470832c57c225cdb3f6115ec203a295d97eb60d0e13ca
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with the document, likely by clicking these links. The document body itself contains a URL that appears to be related to a scam or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-15-free-spin-link-today-game-hack
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/free-robux-only-1-step_GM431946152.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/easy-ways-to-get-free-robux_GM431946152.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/chisel-and-bits-mod-pe_GM479516143.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/game-hack-coin-master_GM406889139.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/coin-master-hack-ios-jailbreak_GM406889139.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/coin-master-invite-friends-free-spins_GM406889139.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/coin-master-app_GM406889139.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/free-spins-coin-master-generator_GM406889139.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/free-rare-cards-for-coin-master-christmas_GM406889139.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/microsoft-rewards-roblox_GM431946152.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/how-to-get-free-roblox-items_GM431946152.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/rbx-free-robux_GM431946152.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/get-more-robux_GM431946152.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/coin-master-free-stars_GM406889139.pdf
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/hack-the-game-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e68.bin
17575b30e3216c23366b305d9105ffdb991c67b8daabbe0fe6330ede43ad2a94		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E68 24536 bytes
font_01_sfnt_off000086ac.bin
5b53a5b683b77cc6f0f815c556bf9926b59998be6e817bd3b756384118128b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86AC 18652 bytes

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