Malicious PDF — malware analysis report

Static analysis result for SHA-256 66190fabb6ccae27…

MALICIOUS

PDF

32.8 KB Created: 2021-07-19 09:16:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2b61dee3ef0444bb111428401ecb8654 SHA-1: 72072dd3397577644e0b8a9f474962e716b98222 SHA-256: 66190fabb6ccae27bcbc396ae125cc4b0bb7a6fbd815fdb73e26b4d3054db249
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and links to a known malicious redirector infrastructure, specifically advertising a "free Robux scam" and "game hack". The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/free-robux-scam-game-hack In PDF document text
    • http://www.eurologistiki.gr/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://www.eurologistiki.gr/images/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://www.eurologistiki.gr/images/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://www.eurologistiki.gr/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eurologistiki.gr/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.eurologistiki.gr/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eurologistiki.gr/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.eurologistiki.gr/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.eurologistiki.gr/images/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://www.eurologistiki.gr/images/how-to-get-free-coins-on-coin-master_GM406889139.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_off0000296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x296B 22876 bytes
SHA-256: 5549eac06b9a55be42d0f9db0752612839b84f65e188632c17406340e3e1c7d5
font_01_sfnt_off00005cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDF 18688 bytes
SHA-256: 5ea472873455d903018ee67e8ec597fe19717b24ef2c5f3c0939751a2ca88b54

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