Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c81edf7f03e4bc2…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 09:08:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 750cdb0eef0b54903d1dda267b96ad3e SHA-1: 80b09da9491e6389a6ee2ad45da90fac11d17d20 SHA-256: 3c81edf7f03e4bc28d004c58eb8d848c0dff044e35177a249e8baadc28552952
102 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF documents related to game hacks and rewards. The primary external URL points to a resource promising 'free Robux rewards', indicating a lure for potentially unwanted or malicious downloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/431946152/free-robux-rewards-game-hack
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://pustaka-smpn3tpi.com//repository/hack-client_GM479516143.pdf
    • http://pustaka-smpn3tpi.com/repository/robux-for-offers_GM431946152.pdf
    • http://pustaka-smpn3tpi.com/repository/free-magical-chest-coin-master_GM406889139.pdf
    • http://pustaka-smpn3tpi.com/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdf
    • http://pustaka-smpn3tpi.com/repository/coin-master-hacks_GM406889139.pdf
    • http://pustaka-smpn3tpi.com//repository/coin-master-hack-apk-2021-download_GM406889139.pdf
    • http://pustaka-smpn3tpi.com/repository/easy-free-spins-coin-master_GM406889139.pdf
    • http://pustaka-smpn3tpi.com/repository/hack-coin-master-dzooka_GM406889139.pdf
    • http://pustaka-smpn3tpi.com/repository/coin-master-game-free-play-online_GM406889139.pdf
    • http://pustaka-smpn3tpi.com//repository/how-to-get-to-village-3-in-coin-master_GM406889139.pdf
    • http://pustaka-smpn3tpi.com//repository/coin-master-daily-free-spins-link-download_GM406889139.pdf
    • http://pustaka-smpn3tpi.com/repository/coin-master-daily-free-rewards_GM406889139.pdf
    • http://pustaka-smpn3tpi.com/repository/100-free-spins-for-coin-master-2021_GM406889139.pdf
    • http://pustaka-smpn3tpi.com/repository/roblox-hacked-version-download_GM431946152.pdf
    • http://pustaka-smpn3tpi.com/repository/free-google-play-promo-codes-coin-master_GM406889139.pdf
    • http://pustaka-smpn3tpi.com//repository/minecraft-diamond-finder-hack_GM479516143.pdf
    • http://pustaka-smpn3tpi.com//repository/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://pustaka-smpn3tpi.com//repository/coin-master-hack-apk-android_GM406889139.pdf
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-cheats_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004cfc.bin
71baa51c10e831fbf19adb5caa2859c3d41d9c561c81e8b17596d7b7fe6ef76b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CFC 25244 bytes
font_01_sfnt_off00008747.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
pdf-font-stream PDF embedded font (sfnt) at offset 0x8747 5696 bytes
font_02_sfnt_off00009459.bin
f6e5d240c50f73aa936fa09c98082d3b637660329d811c3f0d463ac63f7ff7de
pdf-font-stream PDF embedded font (sfnt) at offset 0x9459 18580 bytes