Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76307b80e716764…

MALICIOUS

PDF

33.6 KB Created: 2021-07-20 13:14:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b3fe5eb1110d40d5443b7716610366c6 SHA-1: 85d3781c183a00ba17b7e510ef16bd567accd3e4 SHA-256: d76307b80e71676424fce4caecbed7255d06d53de355648d9c04cca87e501abd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as "free generator" or "game hack" lures. The document body and embedded links suggest a social engineering tactic to trick users into visiting these sites, likely to download further malware or engage in scams. The presence of multiple PDF-specific heuristics indicating malicious redirectors reinforces this assessment.

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/479516143/best-free-minecraft-server-hosting-game-hack In PDF document text
    • http://cristalysoptic.com/images/free-fans-on-tiktok_GM835599320.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://cristalysoptic.com/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-free-spins-2021_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_off00002f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F18 22584 bytes
SHA-256: e3ec5e77645781cdd6c8421fc1750ce4778f365544b0da4ce9e26b36ad2e1315
font_01_sfnt_off00006131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6131 18328 bytes
SHA-256: 0b2d28431e5234c57104fb234e5f183f246f5a4819408a3d571d7ab08b18c1e5

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