Malicious PDF — malware analysis report

Static analysis result for SHA-256 316555fb6aae28aa…

MALICIOUS

PDF

46.6 KB Created: 2021-04-28 01:38:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a7df427b9a30bdc88811b2bbc65181a2 SHA-1: 303bc166c46e07ad33e6871574bb670e55639ef4 SHA-256: 316555fb6aae28aa7aaff3563f54a03c01b44378ec63580b7eb3fea74a0ce28c
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to game hacking, specifically for Roblox, and directs users to a URL that appears to be a redirector for malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/how-to-hack-someone-on-roblox-like-anonymous-game-hack PDF link annotation
    • http://www.saburai.ac.id/elibrary//repository/how-to-play-a-game-that-cost-robux-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/get-free-robux-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/moon-tycoon-roblox-gives-free-robux.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/forum-comment-cheat-sur-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-flood-escape-2-hacks.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/work-at-a-pizza-place-roblox-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/egg-hacker-2021-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-lua-executor-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-codes-list-pastebin.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-fe-roblox-admin-scripts.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_off00004087.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4087 38228 bytes
SHA-256: 1934ad4f741513a99af0fcc37437274a88fc9c10b90ec9d449a006a09390cb22
font_01_sfnt_off0000929b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x929B 19044 bytes
SHA-256: 93c5a422d2ad069e9f48dd93e50727793d424c513ac632535c1a2fa62b237c84

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