Malicious PDF — malware analysis report

Static analysis result for SHA-256 77acf873a798e9fc…

MALICIOUS

PDF

33.5 KB Created: 2021-06-27 22:43:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 758cc4ac82d504c520ea4548a21532e0 SHA-1: f4e6b3bf760d52ff02dae8614a85e7973ec474e0 SHA-256: 77acf873a798e9fc6b1397f50a3a9ccea73eced53dfbd358457573bc5883a1d6
102 Risk Score

Malware Insights

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

The PDF document contains a lure related to "Roblox hacks" and presents a large number of external links, many of which are SEO-optimized PDF documents. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure further supports a malicious intent. The primary URL http://netcdn.co/app/431946152/final-stand-hack-roblox-game-hack likely serves as a download source for a secondary payload.

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/final-stand-hack-roblox-game-hack
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-daily-spin-coin-master-game_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-robux-easy-and-fast_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/coin-master-hacks-for-free-spins_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/hack-for-robux-script_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-robux-promo-codes-2021-march_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today-instagram_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-coin-master-coins-and-spins_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/roblox-robux-codes-2021_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/testing-5-ways-to-get-free-robux-it-worked_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/minecraft-mobile-free_GM479516143.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-robux-site-dont-have-to-complete-offers_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/real-free-robux-codes_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-vip-server-for-roblox-egg-hunt_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-to-get-free-robux-fast_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/roblox-working-robux-hack-2021_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/coin-master-free-spin-today-2021_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/robuxmatchcom-free-robux_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-spins-coin-master-haktuts_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c3e.bin
08b31464c79643945c21a5261eb4e4c4d413ce516800fa00d889b188e57244e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C3E 22272 bytes
font_01_sfnt_off00005d9a.bin
639f4436636a8e524092186f9d5f1e3668148f3c9488bcc1dd3a7a4dc9cfea90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9A 19220 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.