Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef8c114d73f7569…

MALICIOUS

PDF

33.6 KB Created: 2021-07-19 08:43:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: eef426712612432b438a78b0a1d78603 SHA-1: ec86ffd31178dce6ceb7ccc0a7eaea3601b02942 SHA-256: cef8c114d73f756906e3975f58e2a526d45c44c992de68ed9c644ea31de8490f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to malicious infrastructure, specifically a "free generator / game hack" lure. This indicates an attempt to trick users into visiting a compromised site, likely to download a secondary payload or engage in credential harvesting. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/835599320/free-tiktok-hearts-game-hack In PDF document text
    • https://schaefer-rechtsanwaelte.com/images/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/how-to-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/haktuts-coin-master-free-spins_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_off00002f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F42 23008 bytes
SHA-256: cfcf05631b4c2231ca4214b1a365d2748bdd19baf61df4c2950675101760fc32
font_01_sfnt_off00006301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6301 17684 bytes
SHA-256: d2d02d8ba990aafabbf3c8139bcf1f40ce6ab80109d0e8cf226d19766131c391

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