Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa6967be4eeb8fc…

MALICIOUS

PDF

46.8 KB Created: 2021-06-04 01:24:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8c267723348a7c305b63404862fc297c SHA-1: 175a95c751cd3e0ab9d2ddacc80dcbfc70488a28 SHA-256: bfa6967be4eeb8fce8a09d765e11c6a96a3e91be98fe708cf40ccbf039c774ce
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links that lead to external websites, many of which appear to be part of a link farm designed to attract users searching for game cheats or free currency. The ML classifier and the presence of a link farm heuristic strongly indicate malicious intent. The document body, though partially corrupted, contains text related to 'Coin Master' and 'Robux', reinforcing the lure of free in-game items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9749

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 https://netcdn.online/app/406889139/how-to-get-free-coins-and-spins-on-coin-master-game-hack
    • http://e-library.stienobel-indonesia.ac.id//repository/free-robux-without-downloading-apps_GM431946152.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-hack-ios-no-verification_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/free-spins-for-coin-master-hack_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-free-coins-and-spins-link-2021_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/mosttechs-coin-master-free-spins_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id//repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-free-spins-heaven_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/how-to-get-a-free-minecraft-server_GM479516143.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-mod-version-free-download-34-4_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-hack-tool-without-human-verification_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/blox-best-robux_GM431946152.pdf
    • http://e-library.stienobel-indonesia.ac.id//repository/cheating-hacks-for-coin-master_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-hack-no-verification_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/get-free-spins-coin-master-link_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id//repository/can-you-give-me-free-robux_GM431946152.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdf
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000539b.bin
137fa9c6e07d224a12d80168b4075e85d60c1be8e9c11457eba34b44efb051e0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x539B 24188 bytes
font_01_sfnt_off00008a41.bin
00109425b76763440a5569341faade0445b3c9f8514523a6f287fddbc9082efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A41 2868 bytes
font_02_sfnt_off0000942e.bin
1cc62c3a0a16cdc45a8bfa34d4f93d18d6e17ba0d5398a0785b1875f29a446c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x942E 18224 bytes

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