Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3503edb274247c7…

MALICIOUS

PDF

34.0 KB Created: 2021-06-28 06:07:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 57ecfca55de7261b761e2ba322437e92 SHA-1: 7f410a4d7eaf5a13c357ffdb484c5c5f1831f7b2 SHA-256: c3503edb274247c7746e1f2e888f2d9a06a07c9a987b5a00f76b248cbcf28f51
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are related to game cheats and hacks for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious. The presence of a 'download button' heuristic further supports the lure of downloading malicious 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/avatar-roblox-free-items-game-hack PDF link annotation
    • https://www.knjizara-harfa.rs/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/unpatchable-robux-hack-robuxian-code_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/get-roebucks-com_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/descarga-de-roblox-hack-mod_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-nowcom_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D7C 22592 bytes
SHA-256: abe3fb349cf1684401c55e9e28926850c2c4866d0ac420801c02af2b72b83698
font_01_sfnt_off00005fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 19128 bytes
SHA-256: 5712a1bea6adfcdf59de6e2ebfced03621649714f3dd4cf7640f5397ac7fc002

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