Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab8ffbe97e7226a…

MALICIOUS

PDF

36.6 KB Created: 2021-05-20 16:51:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 079d6f79fc80011fa6ac861492b1ad39 SHA-1: 1d766f8d5fd29401e6f9ad7487226fef9e90151f SHA-256: fab8ffbe97e7226a80aa80a629267aa4273fda21b1091e541358c6636b0dc5f6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a call-to-action to download a file, likely a malicious payload, under the guise of providing free Robux. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a password archive lure heuristic further supports this assessment. No scripts were extracted, but the document's content and embedded links indicate a social engineering attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 4

  • 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
  • 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/free-robux-for-kids-game-hack
    • http://pia2000.net/images/coin-master-game-android-free-download_GM406889139.pdf
    • http://pia2000.net/images/how-can-you-get-free-spins-on-coin-master_GM406889139.pdf
    • http://pia2000.net/images/hack-coin-master-game-download_GM406889139.pdf
    • http://pia2000.net/images/apps-for-free-robux_GM431946152.pdf
    • http://pia2000.net/images/roblox-promo-codes-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000311a.bin
c3576941958b6467482ad1abcc0f7b96955c6a7bc2ca4d6dfedee4dcbed6e68f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x311A 26892 bytes
font_01_sfnt_off00006d8d.bin
763c1f2cd60606b291f89f2a80f52d083a3bf80be883c0f2186ef0e0ffb8dff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8D 18308 bytes

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