Malicious PDF — malware analysis report

Static analysis result for SHA-256 b600dc4b22c8b433…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 20:41:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0bad905c9f1bfbba4c4cfb392281a621 SHA-1: 30f3f1e7f5d676840c071eb7301bb6a5ae571fef SHA-256: b600dc4b22c8b4334f7697df4fbe51b71fff400e4f4fe7a6840fbee1f90c7477
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and sites offering game hacks, strongly indicating a lure for users to download further malicious content or engage in phishing. The ML classifier also flagged this PDF with high confidence. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a malicious redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-free-generator-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/tiktok-free-like_GM835599320.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/rbx-earn_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-codes-2021-real_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_004_off00004e1b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E1B 27604 bytes
SHA-256: a521d3c3f926178ab17b58a95f867e1f30566ef1c42175b5b4d7d0e57f225b81
font_01_sfnt_off00008ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE7 17712 bytes
SHA-256: f6b7bbb27796bfdd91832c5c9631b2ef3c604ec4967bc220e21b541acce31e79

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