Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff1aa7e9aafd999…

MALICIOUS

PDF

29.5 KB Created: 2021-07-19 08:20:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f6e1c4eb1be1bf9d650d5909c6f11e0c SHA-1: 7386d12f1b6d78b5a6557b5d2d5b797ba0f850b6 SHA-256: 0ff1aa7e9aafd99931dba9d93f2247be7fc7be86bad8e1fbbf1bb945b78976d1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'Roblox Hacked Com 2021' and 'free robux'. These links lead to known malicious domains and further PDFs, indicating a phishing or scam campaign. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8506

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 http://netcdn.tw/app/431946152/roblox-hacked-com-2021-game-hack In PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-robux-without-human-verification-2021_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
font_00_sfnt_off00001d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D47 22220 bytes
SHA-256: fbc77b227eebdb9a8ee45a71e9ebf8e98215ad7093c7679dd6bf8c7454e2abb6
font_01_sfnt_off00004e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E70 19204 bytes
SHA-256: a843c5ca876463c5b8999cf5589cf4aa204d9a964b83c691331fb87130c2a057

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