Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ffcacba4f5bcb1…

MALICIOUS

PDF

39.5 KB Created: 2021-05-21 22:48:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d9304cddcab1ac67f25801e5a49ae428 SHA-1: d3cd795f9b6237fb6a718c647c19af5f17851a2c SHA-256: c9ffcacba4f5bcb11987d6c8cf6370d7e06d45cc6be0f4c9cde9719699d7b9dc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector. The document body and heuristics indicate a lure for 'free Robux' or 'game hacks', suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lead the user to a site that downloads a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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 https://netcdn.xyz/app/431946152/free-robux-no-verification-needed-game-hack In PDF document text
    • https://www.iadh.bi/images/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.iadh.bi/images/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • https://www.iadh.bi/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://www.iadh.bi/images/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • https://www.iadh.bi/images/how-to-get-free-robux-without-offers_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
stream_002_off000036ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36BA 28424 bytes
SHA-256: 4c844c32398fc2c291ce468cef7f892aef00862bc4a5ec91f29394c6b1db0ca2
font_01_sfnt_off000077be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77BE 18776 bytes
SHA-256: d142001b9e8124b93d34dd5eb493ac1502906b177ba9fa7077e4038994baf40d

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