Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd615b323258e48…

MALICIOUS

PDF

43.1 KB Created: 2021-05-19 02:31:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 879dbee21817ba2c37b257203030e52c SHA-1: e6ae39cefd94dbe4a9f7ad96d143ddadd1d1d186 SHA-256: ffd615b323258e48657f44f2ac76038678ee7b95bec55d92a965b903ac42fb3e
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into downloading a malicious application from the provided URLs. The ML classifier strongly indicated maliciousness, and the document's structure includes a large number of external links, suggesting a link farm or SEO abuse tactic to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/hack-coin-master-apk-3.1-game-hack
    • https://ourlady-elearning.com/userfiles/files/hacks-master-coin_GM406889139.pdf
    • https://ourlady-elearning.com/userfiles/files/free-robux-by-watching-ads_GM431946152.pdf
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-roblox-gift-cards_GM431946152.pdf
    • https://ourlady-elearning.com/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://ourlady-elearning.com/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://ourlady-elearning.com/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • https://ourlady-elearning.com/userfiles/files/free-robux-sites-2021_GM431946152.pdf
    • https://ourlady-elearning.com/userfiles/files/free-robux-site_GM431946152.pdf
    • https://ourlady-elearning.com/userfiles/files/hack-coin-master-apk-download_GM406889139.pdf
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdf
    • https://ourlady-elearning.com/userfiles/files/hack-to-protect-village-on-coin-master_GM406889139.pdf
    • https://ourlady-elearning.com/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdf
    • https://ourlady-elearning.com/userfiles/files/robuxlove-net-free-robux_GM431946152.pdf
    • https://ourlady-elearning.com/userfiles/files/hack-coin-master-download-ios_GM406889139.pdf
    • https://ourlady-elearning.com/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • https://ourlady-elearning.com/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdf
    • https://ourlady-elearning.com/userfiles/files/moonactive-free-spins-coin-master_GM406889139.pdf
    • https://ourlady-elearning.com/userfiles/files/robux-miner_GM431946152.pdf
    • https://ourlady-elearning.com/userfiles/files/coin-master-hack-reddit_GM406889139.pdf
    • https://ourlady-elearning.com/userfiles/files/get-free-robux-today_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e9b.bin
c19d526fa5b9a64d35058bf2dcf57a086a1d9f3ab33a9217c2772fd817236215
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E9B 24424 bytes
font_01_sfnt_off00008651.bin
5636c98907b37cd2f3b18b852a769869e56538390fa3c424135df3ff3f072bbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8651 18240 bytes