Malicious PDF — malware analysis report

Static analysis result for SHA-256 3783215ed845fa76…

MALICIOUS

PDF

35.5 KB Created: 2021-06-19 18:25:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 386b60ae08faaf428afd64542eac983e SHA-1: 01e62f91cd83c318d69ade3045a40512cd9d92fd SHA-256: 3783215ed845fa76e3082dad44543c5125de9433096abce6b7a66ab96ddda95a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs and a document body that promotes free Robux and game hacks, indicating a lure for potentially malicious downloads. The PDF_SEO_LINK_FARM heuristic firing suggests a large number of external links, likely part of a link farm designed to attract users searching for such content. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of this document.

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/free-robux-method-that-still-works-game-hack
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/wahoo-gaming-co-free-robux_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/but-link-says-free-robux-walter_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/i-got-hacked-on-roblox_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/real-robux-codes_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/minecraft-free-download-windows-10_GM479516143.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/roblox-free-play_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/hack-coin-master-without-verification_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/coin-master-heaven-free-spins_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-robux-without-verification_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/robux-cheat_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-coin-master-coins-and-spins_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/coin-master-links-for-free-spins-2021_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/ways-to-get-free-robux_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/100-free-coin-master-spins_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/how-to-get-free-coins-on-flip-master_GM406889139.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/microsoft-rewards-robux_GM431946152.pdf
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-100-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033e8.bin
11ac88f0e18b5ec35595330206b85505caeab92c4705a678c7c390146f914bc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x33E8 21512 bytes
font_01_sfnt_off00006337.bin
e104b1668e5cfdb61ea8d94095e6d58a14652bad23fca3f1e8bddeb24b782487
pdf-font-stream PDF embedded font (sfnt) at offset 0x6337 19920 bytes