Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c950769146f54a…

MALICIOUS

PDF

41.6 KB Created: 2021-05-01 02:17:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d723ef8f95e387d9279ec09473181d6b SHA-1: 016b585735524f4d95cf6e790e13fe16ddedd61e SHA-256: 86c950769146f54ac7b5440a3d597571f592d054b642f8dfaeaf8c39312b1674
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document uses a lure related to free Roblox items to entice users to click on external links. The ML classifier strongly indicates maliciousness, and the heuristic for disabling security software is a high-risk indicator. The embedded links likely lead to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/roblox-supreme-shirt-free-game-hack PDF link annotation
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-mod-hack-tool.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/hack-account-roblox-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/hacker-texting-simulator-simulator-roblox-code.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-codes-pc.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/rbx-roblox-free.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/pastebin-robux-hack-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/script-cheat-ninja-legend-roblox.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/roblox-one-piece-golden-age-devil-fruit-hack.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-pro-roblox-gear.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-any-item-for-free-in-roblox-2021.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004410.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4410 26116 bytes
SHA-256: 2c0571c9bdd293b515f00a2a438f5cf1261fd43f6d53fe3b89f86b45ca3e2808
font_01_sfnt_off00007f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F78 18912 bytes
SHA-256: 256f1a0c4a5723f427a3f151dfda78ac402133d36276435c5abfea341d5541fa

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