Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d23d121a1131e4…

MALICIOUS

PDF

43.0 KB Created: 2021-05-17 07:17:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 23657729fb33b5ecaa60f0521530f926 SHA-1: 26cb52cb3c7bf056e0cb43ad0574dd96f401c27e SHA-256: 91d23d121a1131e45021cf8d01822919b307ddf134ec731aca6e50d06a38416e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack designed to lead users to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-tricks-and-hacks-game-hack In PDF document text
    • https://www.zagi.hr/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://zagi.hr/files/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.zagi.hr/files/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://zagi.hr/files/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.zagi.hr/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://zagi.hr/files/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://www.zagi.hr/files/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://zagi.hr/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://zagi.hr/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://zagi.hr/files/rbx-claim_GM431946152.pdfIn PDF document text
    • https://www.zagi.hr/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.zagi.hr/files/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://www.zagi.hr/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.zagi.hr/files/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://zagi.hr/files/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://zagi.hr/files/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://zagi.hr/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.zagi.hr/files/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://zagi.hr/files/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.zagi.hr/files/coin-master-hack-apk-2021-download_GM406889139.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
stream_003_off000049e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E3 27652 bytes
SHA-256: 424c42ce3732a8a77e8370b86952c5ed10dbb79410d5cd1035856cf26492b207
font_01_sfnt_off000086f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F6 17888 bytes
SHA-256: 6b40f6b54227a57bca670b7ddbf89328ee1638c3cadd4e2aadbe35f25d791a64

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