Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd6cb7b742959bb…

MALICIOUS

PDF

42.8 KB Created: 2021-05-12 22:31:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0e17c277fa1b1a841953a7628127d389 SHA-1: c7e198908c0abff5c2a03beaa62fd214041baa57 SHA-256: fbd6cb7b742959bbd9480eba9cb529b6d311e39cd3b248414d04f71eaff1c4ca
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links to external websites, many of which are structured as a link farm for game-related cheats and currency. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or downloads. The primary IOC is the URL associated with the download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/479516143/wurst-download-game-hack
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-easy-and-fast_GM431946152.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-mojang-free_GM479516143.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/mcpe-optifine_GM479516143.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-daily-free-link_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/free-coin-master-gifts_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-hack-to-get-robux_GM431946152.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/apps-to-hack-coin-master_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-hack-ios-download_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-links-for-today_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/coin-free-master_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-free-spins-daily_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-spin-link-today-free_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/new-free-spins-coin-master_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-link-spin_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-spins-and-coins_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/minecraft-hack-client-18-9_GM479516143.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-hack-pro-gamers_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-apk-114_GM479516143.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/hack-coin-master-apk-ios_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a7a.bin
5de51c44e4c974e85db626e33dd7e6bbc6a312181b7826105207688767247609		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A7A 25472 bytes
font_01_sfnt_off00008434.bin
fa1f483b34cb572f7f62a7150fe0d508507468ba2dbe973ec2c8b024440d6681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8434 18508 bytes

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