Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b710edc4e1ff2f…

MALICIOUS

PDF

34.9 KB Created: 2021-06-25 06:13:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bd1f4026ab2386ad7ce9128652e571cc SHA-1: b5237149ed43d7d7f4647661129021b0093d7bd4 SHA-256: 17b710edc4e1ff2f5c459f467bd20669e02ce6a2ac40daed5715d11af4ea3d82
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 related to free Robux, game hacks, and free spins for Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a download button lure further supports a malicious intent to redirect users to potentially harmful content.

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/are-the-free-robux-fake-game-hack
    • https://www.knjizara-harfa.rs/files/how-to-add-mods-to-minecraft-pe_GM479516143.pdf
    • https://www.knjizara-harfa.rs/files/free-robux-websites-2021_GM431946152.pdf
    • https://www.knjizara-harfa.rs/files/avatar-roblox-game_GM431946152.pdf
    • https://www.knjizara-harfa.rs/files/free-spins-coin-master-haktuts_GM406889139.pdf
    • https://www.knjizara-harfa.rs/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • https://www.knjizara-harfa.rs/files/coin-master-links-to-free-spins_GM406889139.pdf
    • https://www.knjizara-harfa.rs/files/free-spins-coin-master-no-verification_GM406889139.pdf
    • https://www.knjizara-harfa.rs/files/i-got-hacked-but-i-want-my-account-back-roblox_GM431946152.pdf
    • https://www.knjizara-harfa.rs/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdf
    • https://www.knjizara-harfa.rs/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdf
    • https://www.knjizara-harfa.rs/files/free-robux-script_GM431946152.pdf
    • https://www.knjizara-harfa.rs/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • https://www.knjizara-harfa.rs/files/how-to-get-free-faces-on-roblox-2021_GM431946152.pdf
    • https://www.knjizara-harfa.rs/files/robux-game-com_GM431946152.pdf
    • https://www.knjizara-harfa.rs/files/how-to-o-get-free-coin-master-spins_GM406889139.pdf
    • https://www.knjizara-harfa.rs/files/coin-master-free-link-spin_GM406889139.pdf
    • https://www.knjizara-harfa.rs/files/roblox-robux_GM431946152.pdf
    • https://www.knjizara-harfa.rs/files/coin-master-daily-free-spin-and-coin_GM406889139.pdf
    • https://www.knjizara-harfa.rs/files/how-can-u-get-free-robux_GM431946152.pdf
    • https://www.knjizara-harfa.rs/files/youtube-how-to-get-free-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_off0000317c.bin
29f34247d3d73cf856475744e4e85a08b32ad07dd51ec94424b6a45e7fce5328
pdf-font-stream PDF embedded font (sfnt) at offset 0x317C 22468 bytes
font_01_sfnt_off0000639f.bin
fef8f1943ca2d7cf1dee7514d51b0b4e4f92170970e9607ec0ec99da11e77a18
pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 19052 bytes