Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5854818b813d9be…

MALICIOUS

PDF

42.7 KB Created: 2021-05-18 03:02:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b563335781cb27cd8a4f1e0b428b3a6a SHA-1: db92a181bdde756aa57101e241120e036b1da368 SHA-256: b5854818b813d9be5313a459cf1013610dc8d4b46332c21d386a059d6ffbacd9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for 'game hacks' and 'free spins'. The primary malicious URL identified is https://netcdn.xyz/app/406889139/free-spins-coin-master-links-twitter-game-hack, which is used in conjunction with a call-to-action phrase to encourage downloads. The document's structure and embedded content strongly suggest a phishing or scam attempt designed to trick users into visiting malicious sites.

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/free-spins-coin-master-links-twitter-game-hack In PDF document text
    • https://pneukalousek.cz/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/roblox-tracker_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/roblox-sued_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-hack-tool-v1-9-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_off00004b5a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B5A 24896 bytes
SHA-256: 46c56d5ce3e50c42631a43fce6a17fb8c91e50f694661a2e2a1a01248ea2f2fd
font_01_sfnt_off000084bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84BF 18220 bytes
SHA-256: a8042c8be0da33bfea773b5dc12ed23934315e0f49b2af9c9120623c9b8fda06

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