Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9c651fbd489bb1…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 07:19:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b3e6aac0df9e6f224788d5c8bea9a90b SHA-1: c3b9204679a3195cdaa3fb250fd78d1ad3b2e84b SHA-256: 4d9c651fbd489bb1738676b560ef41a7b44f89d32518f04739cbacf05d8af2f7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to known malicious redirector infrastructure, specifically promoting "game hacks" and "free spins" for popular games. The primary malicious URL identified is https://netcdn.online/app/406889139/coinmaster-links-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful content or further malicious sites. The presence of a visual download button lure reinforces this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/coinmaster-links-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/robux-online_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-no-survey_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_004_off000051bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51BF 27768 bytes
SHA-256: 3c8c320a645b3df7ea79b6eaa277ae8f821edbaf9688f9b47fc6aa7006a83db3
font_01_sfnt_off00009132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9132 17976 bytes
SHA-256: a321bb876bfba90ca025b4c3027fd158f72fae1f747322c9d5199a500aa286eb

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