Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f7fbb881c77aff…

MALICIOUS

PDF

34.9 KB Created: 2021-06-23 12:03:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4e7154920abda24532e7a35e2204b254 SHA-1: c8e7d1e0449141f775e218cd49cef80e94769ed8 SHA-256: 83f7fbb881c77aff014f47d50cd03222194c84c846a26426349490e91b3cf778
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering 'Roblox hacks' or 'Coin Master cheats'. The primary URL, http://netcdn.co/app/431946152/online-roblox-hack-2021-game-hack, likely serves as a lure to download a malicious payload. The ML classifier strongly indicated maliciousness, supporting the interpretation of this document as a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/online-roblox-hack-2021-game-hack
    • http://www.romento.com/uploaded_files/userfiles/files/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/free-mod-apk-coin-master_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/add-robux_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/how-can-you-get-free-robux_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-list_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/robux-generators-that-actually-work_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/roebucks-on-roblox_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/free-robux-place_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/cheat-code-for-roblox-tides-knife_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/stock-speed-coin-master-free-spins_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-spin-link_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/free-robux-without-downloading-anything_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/how-to-hack-roblox-cheat-engine-66_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-free-spin-app-iphone_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/roblox-free-robux-website_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-free-box_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/free-coin-master-spins-hack_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/get-free-spins-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031c0.bin
a14a9364b2206d074e8f1fbd0039c1a6b43002c3a68df8e3f64ee011f8baf5e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31C0 22208 bytes
font_01_sfnt_off000062c9.bin
74ddec6684e23003b7f623a0d6a3909f066f51a13f34c92da9cb01ddbc3f096b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C9 19180 bytes

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