Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa72b2b1caa8d109…

MALICIOUS

PDF

37.6 KB Created: 2021-05-20 12:51:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3ef3da038da8be6155e8a34fa8a419d3 SHA-1: aa2d7cfc0b8e389bf4b5fc6ab80b88fafb33bfb1 SHA-256: aa72b2b1caa8d1093d73d6731517f443722a2a2db7f6c8d6ce08807285648317
122 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and a prominent external URI pointing to a domain associated with free Robux, a common lure for gaming-related scams. Heuristics indicate the document uses social engineering tactics like a fake download button and a lure for browser extension installation, often used to deliver malware or steal credentials. The presence of a password-protected archive lure suggests an attempt to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/give-free-robux-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F2 28084 bytes
SHA-256: 76c540340d192be926f2493e13c7596360eee96c1bdbf7ff4be87156c33a06c4
font_01_sfnt_off000071b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B5 18248 bytes
SHA-256: ea59f1cb8b041c2b832a039673c57edae81c360e33a5bea04888abdf43ec1c43

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