Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc495b41cf56df98…

MALICIOUS

PDF

32.5 KB Created: 2021-07-20 05:33:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 989d452d66157257c4dc4d66ba900c2d SHA-1: 2f4e06e1322a76856c0cb19e0eccaea12506f90f SHA-256: cc495b41cf56df98e17648f7778f8b6c490fd119e9d569bcad4112343a8cf50d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "free generator / game hack" lures. The primary malicious URL identified is http://netcdn.tw/app/431946152/how-to-get-free-robux-without-verification-or-surveys-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/how-to-get-free-robux-without-verification-or-surveys-game-hack In PDF document text
    • http://iacfhouston.com/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/tiktok-like-bot-free_GM835599320.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_off00002bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BC9 21844 bytes
SHA-256: b485a752a6e07a7ec721f8b9478d8e8520907ee4ff947b24a17ddd2d15f7cba4
font_01_sfnt_off00005bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCE 19608 bytes
SHA-256: c4b40d882647ca438afa2539681b5ac4bc26dce61d3295ce86b6fc67a4011c31

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