Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d377d075b78a839…

MALICIOUS

PDF

33.1 KB Created: 2021-06-29 14:25:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 10e67b9b48844d55192a8046ea3a5a41 SHA-1: 1e43c82c237e297fddab5b778a0cad0ad8407f66 SHA-256: 8d377d075b78a839c7d64c6b7927ca345405f18ec551b200d2d19d4d8f9a8de4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on `www.3d-gold.com.hk` and offer "free Robux" or game hacks. The document body explicitly mentions "Get Free Robux From Watching Ads" and "CLICK HERE TO ACCESS ROBUX GENERATOR", indicating a lure for users to click these links. The presence of a PDF URI heuristic and the ML classifier output strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/get-free-robux-from-watching-ads-game-hack
    • http://www.3d-gold.com.hk/upload/files/free-robux-hack_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/roblox-promo-codes-free-robux_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-spins-link-2021-ios_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/money-hack-roblox-retail-tycoon_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/roblox-hacked-version_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/pubg-uc-price_GM1330123889.pdf
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/roblox-vpn-free_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/coin-master-hack-8-ball-pool_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-tiktok-followers-without-downloading-apps_GM835599320.pdf
    • http://www.3d-gold.com.hk/upload/files/roblox-street-racing-unleashed-cheats_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/master-coin-hack-game_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-roblox-gift-cards-that-can-be-used-unlimited-times_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/get-free-spins-from-coin-master_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-robux-gift-card-codes_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/como-robar-cuentas-de-roblox-con-hacks_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/minecraft-bedrock-hacks_GM479516143.pdf
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-robux-games_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/coin-master-cheats-and-hacks_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-coin-master-spins-for-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ae9.bin
5d12facea4e6248b6ee37903e731bb48317ce9d4ab9ae35350f4c0653ae3993f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2AE9 21808 bytes
font_01_sfnt_off00005acf.bin
08eb1df913845f9bb8ea89849d949ba1e54d204a623032708aa037b3512f1107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACF 19740 bytes

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