Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fd58c020876a0b…

MALICIOUS

PDF

40.7 KB Created: 2021-04-27 09:51:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a919a5370f649207b6cdde33051a636b SHA-1: 138019aca7e87b2a5fdef313331a2d39f095be49 SHA-256: 75fd58c020876a0b5f41d5173acb4ed7bbc0f64d5a9e2128eded07e48ce24feb
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a prominent link to a website offering 'free Robux' and uses urgency lures, suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the overall context indicate a likely attempt to redirect the user to a malicious site, potentially to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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-promo-cides-game-hack PDF link annotation
    • http://www.saburai.ac.id/elibrary//repository/roblox-frappe-hacks.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-do-you-get-the-hack-no-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/skin-hack-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-gift-cards-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-shard-online-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/babe-free-robux.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/como-hackear-cuentas-de-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/hacks-to-get-free-robux-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-obby-gives-you-free-robux-july-no-password-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-booga-booga-speed-hack.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_003_off000041db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41DB 25792 bytes
SHA-256: 8029d154b095818aa5606e8fd4215f3190400269aa0ecc486301421d12aff33a
font_01_sfnt_off00007c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3A 18720 bytes
SHA-256: f7c5f1dc3cb07fffc9748dc283e88c79633d4d122f0515772c6474d1ea785360

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