Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a5c5fddb6e3bda…

MALICIOUS

PDF

41.3 KB Created: 2021-05-11 19:43:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b1e0ff12351d4619a7f3956ee9778f72 SHA-1: a9d9410711c73824e2f1556faeb36dc6153a8ea4 SHA-256: 97a5c5fddb6e3bdab4d5496b7a19e2fd204bc32794f96ef3a71b2194cf008511
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external links, many of which point to other PDFs, suggesting a link farm for SEO manipulation. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with the document. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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-gold-cards-game-hack
    • https://sundae.co.th/js/userfiles/files/free-spins-coin-master-daily_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-apk-33-download_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/coin-master-free-daily-spins_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/daily-coin-master-free-spin-apk_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/claim-coin-master-free-spins_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/free-robux-no-gift-card_GM431946152.pdf
    • https://sundae.co.th/js/userfiles/files/minecraft-for-free-on-phone_GM479516143.pdf
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/free-executor-roblox_GM431946152.pdf
    • https://sundae.co.th/js/userfiles/files/robux-free-gift-card_GM431946152.pdf
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-games_GM431946152.pdf
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-link-2021-download_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/coin-master-free-400-spin-link_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/minecraft-free-download-iphone_GM479516143.pdf
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-link-download-hack_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/to-get-free-robux_GM431946152.pdf
    • https://sundae.co.th/js/userfiles/files/hack-coin-master-2021_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-mod-apk-35-8_GM406889139.pdf
    • https://sundae.co.th/js/userfiles/files/minecraft-bedrock-free-server-hosting_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004690.bin
83d62827cf31df4ab1b7409941dfdd20dac661dfd81d1ef017c458f3014a9486		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4690 25360 bytes
font_01_sfnt_off0000800b.bin
8682528a83dd112d81181b55b0947f4d42ad7746a23a86464d464a09275f8c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800B 17960 bytes

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