Malicious PDF — malware analysis report

Static analysis result for SHA-256 a453935bebcebc47…

MALICIOUS

PDF

46.4 KB Created: 2021-05-13 11:33:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1e1d583fb0318cd335e1076b5c9b102f SHA-1: 6ac731f5e1581c6c72153eed8a9ff4f34675b99f SHA-256: a453935bebcebc47d0b2330f4d920da8721757ff8934321e70989ee01bd41fdc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to external PDF files, a technique often used for SEO spam or to distribute further malicious content. The ML classifier also flagged this PDF as malicious with a high score. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content, possibly related to game hacks or cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/406889139/free-spin-link-for-coin-master-game-hack
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-hack-2021-android-apk_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-spins-link-facebook_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/google-roblox-games_GM431946152.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/free-robux-obby_GM431946152.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/clean-master-hack-coins_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/free-coin-master-androd-cheats-2021_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/hack-coin-master-apk-download_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/hack-coin-master-spin-apk_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/hack-master-coin_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-mast-hacks_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/free-bedrock-minecraft_GM479516143.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/www-robux_GM431946152.pdf
    • http://repository.poltekkesjakarta3.ac.id/repository/games-like-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ab6.bin
18a90fe52b3e6032c5c3a0db73c319816d1468db3de55b0aeea633aff203891b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB6 27372 bytes
font_01_sfnt_off0000897a.bin
6e07e6753a1b7f3946429eb05e6ec352f38d71971554550c1c0ea562d62df99c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897A 2912 bytes
font_02_sfnt_off00009388.bin
b406b504177f6b640bc1dbcd325e02770f8a0621b64b682f119f0b5c1d0e735d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9388 18056 bytes

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