Malicious PDF — malware analysis report

Static analysis result for SHA-256 8581a129351ffc69…

MALICIOUS

PDF

41.6 KB Created: 2021-05-14 22:40:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4a49fb0081819ea1fdf2222d0d515884 SHA-1: 515ab20fc906bebcbc7a6c119f9d7edeec1cb994 SHA-256: 8581a129351ffc694a63d0160854b7ce2649a13f870cf25c2c6fadfc9396a70e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a document body that promotes hacks for games like Coin Master and Roblox, suggesting a phishing or scam attempt. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely to further scam or malware distribution sites. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure point towards a malicious intent to redirect users to potentially harmful content.

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/406889139/coin-master-root-hack-game-hack
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/get-free-robux-gg_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-latest-mod-apk-free-download_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/robux-hack-no-verification_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-robux-codes-not-used_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/robuxlove-net-free-robux_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-heaven-links_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/moonactive-coin-master-free-spins_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/minecraft-hack-client-18-9_GM479516143.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-hack-game-download-mod-apk_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-spin-coin-master-game_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-spin-link-new_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-coin-master-spins-link_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/rbxoffer-com-free-robux_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/www-roblox-com-robux-free_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-spins-on-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_off000049b1.bin
2000ce1eafe96a38ffda69b3837f45cdb725fabaeccb992a719fa5979a5007df		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B1 24676 bytes
font_01_sfnt_off000081f1.bin
3314f7b38d470594eaa73d4973565fc6f74845bbaa83b1a4a8a9c9b025514e4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F1 17716 bytes

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