Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd687a24fb764741…

MALICIOUS

PDF

45.6 KB Created: 2021-05-14 05:01:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3bc3be78885522d95b9ae80cbee1e599 SHA-1: c840bf4dc372a2383b938c93b8966246c58a5c7f SHA-256: cd687a24fb764741d7ca48edac1469ef83956a9088879a49f3427134202a585e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and potentially unwanted content, masquerading as game hacks and free generators. The primary malicious link identified is https://netcdn.xyz/app/479516143/minecraft-windows-10-free-with-java-game-hack. The document's structure and embedded links strongly suggest it is designed to lure users into clicking these malicious URLs, likely leading to further malware downloads or phishing attempts. No scripts were extracted, but the PDF's nature points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/479516143/minecraft-windows-10-free-with-java-game-hack In PDF document text
    • https://knj.com.tw/image/data/files/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-verification_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/robux-apk_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/mathep_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.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_off00004b15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B15 29488 bytes
SHA-256: bf6f44daeb6175b869ddb6fcb2d9cf7bbff381271519ee6da61acdda7f8a73c6
font_01_sfnt_off00008e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E00 18972 bytes
SHA-256: ec0d7e7957d6d3ec4a312ebe7c12434b242d64f4f861d318395950ba1ef4cb73

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