Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4028123d4ca184…

MALICIOUS

PDF

30.1 KB Created: 2021-07-19 00:32:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d75ad714a49350585f62a618a8e5cca5 SHA-1: d4ea964c6a812f159b257aa3d8956f2207b5566c SHA-256: ef4028123d4ca184c20385b486632a74d98eacc433f631575ebdcee7dcb0c79a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free Robux' or 'game hacks'. The document body and heuristics indicate a lure designed to trick users into visiting these sites. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9252

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/free-robux-accounts-game-hack In PDF document text
    • http://hk-kan.org/images/free-tiktok-comments_GM835599320.pdfIn PDF document text
    • http://hk-kan.org/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000021e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E7 22304 bytes
SHA-256: 143c8d8f0b506be7c610e1daffe820bdeaf9a4db87cee1d6b9dbe9c3127dff3c
font_01_sfnt_off000053be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53BE 18304 bytes
SHA-256: c204acef3e551231e5c23dbfbb2d775467b579b40a97e419668be00c01df0aed

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