Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4fe89fb613a2ce…

MALICIOUS

PDF

38.4 KB Created: 2021-05-25 06:35:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8d9cf93c9b22b19efa5bd0784707473e SHA-1: 77af7daccdff59f3203c388a6135259144342269 SHA-256: 2e4fe89fb613a2cef8c5107766ef262ce16d8fce48d7616b0422e997022b8baf
82 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded URLs and heuristics indicating a social engineering lure. Specifically, the 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document prompts the user to install a browser extension or update. The presence of external URIs and the ML classifier's positive prediction further support a malicious classification. No scripts were extracted from this sample, limiting the ability to determine the exact payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7268

Heuristics 4

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/free-tiktok-likes-app-game-hack
    • http://library.fikes.upnvj.ac.id/repository/earn-free-robux-today_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-spins-coin-master-app-iphone_GM406889139.pdf
    • http://library.fikes.upnvj.ac.id/repository/free-group-roblox_GM431946152.pdf
    • http://library.fikes.upnvj.ac.id/repository/minecraft-mojang-free_GM479516143.pdf
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spin-no-offers_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000333b.bin
85e899f8a8bcaa2f829aa919debc740a0e18469f5221047e3e5b1ea9091e08a0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x333B 24484 bytes
font_01_sfnt_off00006b48.bin
3b08ef8e334a575f9b8b2fc6a4f43ffb994391af2ff078f405bcf89b9b3cb1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B48 3256 bytes
font_02_sfnt_off00007688.bin
7e13fbc4119f45c5ff512709f8e7b8078fcbed6cc64991a23ef627420002bfc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7688 17632 bytes

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