Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a1adbb7741d840…

MALICIOUS

PDF

44.0 KB Created: 2021-05-16 02:10:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d578690c04c6260d705d41903a3df0b4 SHA-1: a3e9a3f9c756758df847f5cbcbd8257d69a0c39e SHA-256: 81a1adbb7741d840e784e4c925e3afd99e06f5170d6da5805eba0ae0268c2178
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to pages offering game hacks and free currency, indicating a lure for potentially unwanted applications or scam content. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic further supports a malicious intent to redirect users to external resources. The embedded JavaScript likely facilitates the redirection or obfuscates the malicious links.

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.
  • 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/479516143/how-to-get-minecraft-pe-for-free-ios-game-hack
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-hack-apk-download-latest-version_GM406889139.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/get-me-robux-for-free_GM431946152.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/best-site-for-free-coin-master-free-spins_GM406889139.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-now_GM431946152.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-free-spins-2021-app-download_GM406889139.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/what-is-exploiting-in-roblox_GM431946152.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-for-kids-no-verification_GM431946152.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-free-spins-2021-today_GM406889139.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-35-2-hack_GM406889139.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/claimrbx-free-robux_GM431946152.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-no-verification-needed_GM431946152.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-coin-app_GM406889139.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/roblox-hacks-com_GM431946152.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-free-coins_GM406889139.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-free-coins-cheat_GM406889139.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-t-shirt-roblox_GM431946152.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/minecraft-servers-that-allow-hacks_GM479516143.pdf
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/hack-coin-master-for-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f48.bin
15f5c97f02c6faa624d0c35eb4252413dfe4836fc864ad2b833cc036961ae87e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F48 25968 bytes
font_01_sfnt_off00008a88.bin
3ef771fcdeed521b42e77c192c553d5a3bd318aced348222e5c137e62eefd75e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A88 18028 bytes

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