Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf8139d8c4d8415…

MALICIOUS

PDF

49.3 KB Created: 2021-05-19 07:18:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5485c01b7caeadf0ef086930e6f9a3ba SHA-1: 0b193e9a20b0e9fe6760cb3612c76553d059fd36 SHA-256: 8cf8139d8c4d8415947629525e0280901cc4ba533a1b85b01c002679a816652b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to known malicious redirectors, specifically advertising "free generators" and "hacks" for popular games. The primary redirect URL is https://netcdn.xyz/app/406889139/coin-master-free-gold-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

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-free-gold-game-hack In PDF document text
    • http://www.jsvillas.com.tw/assets/files/robux-now_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-robux-without-downloading-apps_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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d41.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D41 25676 bytes
SHA-256: 366ec8a135694cbfc0342721969e16f554f4a7b9c1ef90e88295e17d6112c03e
font_01_sfnt_off00008799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8799 4028 bytes
SHA-256: a17c2a746d49ac23b23e38a371e32fddecfcd91b10cf42ff6155bff6b8a07e91
font_02_sfnt_off0000953a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x953A 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off00009f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F2A 17960 bytes
SHA-256: aba9a61c61b61fea048b73d77d5e297f3d5a3a83c57e433c8854d820da1f91b9

Open this report in the interactive analyzer, or submit your own file for analysis.