Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd90393ffa412fb1…

MALICIOUS

PDF

37.2 KB Created: 2021-05-25 09:02:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 554dde32127ca5929acc08060db6f31e SHA-1: 45346c6daaf490a494872ae02ff8fb3b2e265caa SHA-256: bd90393ffa412fb133751c2e8314cc874b403a7953d8f833ec49d35f629ba8c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically promoting 'free spins for Coin Master' and 'game hacks'. The document body and heuristics indicate a lure to a generator or hack, which is a common social engineering tactic. The embedded URLs are designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/406889139/free-spins-for-coin-master-app-game-hack In PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-roblox_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_off000033e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33E0 26672 bytes
SHA-256: 8492db6cdb0a6da1ad14db0e53a44314d6ace6031f709a7264b01c0aba0978ef
font_01_sfnt_off00007170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7170 17884 bytes
SHA-256: c0e07e045f0496ba68af439e810d5bb13e23b0d850ef9426c095223eaa712aa7

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