Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ec9213b949b667…

MALICIOUS

PDF

45.0 KB Created: 2021-05-11 03:36:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3cb57e65f25e2edbc5b12cf60f3c0868 SHA-1: 69f72de987dcdc4a363f48168ae96409a9d2b65b SHA-256: 13ec9213b949b66741d2010f7f45291ef025d6fd43cd9025dea25e4fb471f19c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure for game-related cheats and currency to trick users into clicking malicious links. The embedded URLs lead to known malicious redirectors, which likely serve as a gateway to further malicious content or exploits. The ML classifier strongly indicated maliciousness, supporting the observed redirection behavior.

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/406889139/coin-master-links-for-free-spins-2021-game-hack In PDF document text
    • http://www.makoto.su/images/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://www.makoto.su/images/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/free-robux-please_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/roblox-person_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/roblox-free-items_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/oginject-co_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://www.makoto.su/images/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/coinmaster-links_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004db0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB0 27744 bytes
SHA-256: e18c7e7c856e1f5ad07650c7d2f0c3016c793e765514aee3ffe3a71158224eeb
font_01_sfnt_off00008d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5A 18456 bytes
SHA-256: a92e7a86c8f96ab5d5d3ed0cab2d9be7dec7c1a4821e4e0502d142dbf0f5217f

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