Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc9a3ff0e9f9a72…

MALICIOUS

PDF

41.7 KB Created: 2021-05-19 16:29:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6b39d7e79cb8cb8e0c3254634e4fd7fd SHA-1: dbb7fe56e775b5d8d64f72692332b24da94c51cf SHA-256: 2bc9a3ff0e9f9a720d1538e28f910526c538ed876ad6f83899225f26da741a29
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous embedded URLs that link to external resources, many of which are presented as game-related hacks or vouchers. The heuristic firings indicate a PDF link farm and a malicious ML classification, strongly suggesting the document is designed to redirect users to malicious content. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading further payloads.

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/1330123889/pubg-uc-voucher-game-hack
    • http://iacfhouston.com/images/coin-master-free-coins--spins_GM406889139.pdf
    • http://iacfhouston.com/images/coin-master-free-spins-gratis_GM406889139.pdf
    • http://iacfhouston.com/images/free-robux-no-survey-or-human-verification_GM431946152.pdf
    • http://iacfhouston.com/images/haktuts-coin-master-hack_GM406889139.pdf
    • http://iacfhouston.com/images/roblox-gift-card-for-free_GM431946152.pdf
    • http://iacfhouston.com/images/coin-master-real-free-spins_GM406889139.pdf
    • http://iacfhouston.com/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • http://iacfhouston.com/images/how-to-hack-coin-master-without-root_GM406889139.pdf
    • http://iacfhouston.com/images/free-robux-generator-no-survey_GM431946152.pdf
    • http://iacfhouston.com/images/free-coin-master-coins_GM406889139.pdf
    • http://iacfhouston.com/images/minecraft-windows-10-edition-hacked-client_GM479516143.pdf
    • http://iacfhouston.com/images/minecraft-windows-10-hacks_GM479516143.pdf
    • http://iacfhouston.com/images/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://iacfhouston.com/images/minecraft-free-ios-2021_GM479516143.pdf
    • http://iacfhouston.com/images/tiktok-free-money_GM835599320.pdf
    • http://iacfhouston.com/images/roblox-top_GM431946152.pdf
    • http://iacfhouston.com/images/free-roblox-account-generator_GM431946152.pdf
    • http://iacfhouston.com/images/coin-master-free-coins-and-spins-hack_GM406889139.pdf
    • http://iacfhouston.com/images/100-free-spins-coin-master-link_GM406889139.pdf
    • http://iacfhouston.com/images/minecraft-com-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048d1.bin
fdef966aba49d165bbd7300582a8d85e161b52e5b158efe685cca042523e4d01
pdf-font-stream PDF embedded font (sfnt) at offset 0x48D1 24252 bytes
font_01_sfnt_off00008088.bin
10db02f4b1401a5dd02a22f084e9f7057729daa9d790706f9921932124bfe87a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8088 18340 bytes