Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6037e83000cc90…

MALICIOUS

PDF

33.0 KB Created: 2021-07-25 12:11:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b35f52d1d0ff0514ed418cdd946454b0 SHA-1: df3a7a346aac1172954aefc76c3ddafe6d0cc084 SHA-256: 3a6037e83000cc90d74e7a295b4fae8deb139e49c2139cf7a4553d120da28490
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising free game currency and hacks. The primary lure URL is http://netcdn.tw/app/431946152/how-to-get-free-robux-easy-no-download-game-hack, which is designed to trick users into clicking through to potentially harmful content. The document body and embedded URLs reinforce this social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/431946152/how-to-get-free-robux-easy-no-download-game-hack In PDF document text
    • http://mmech.com/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://mmech.com/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mmech.com/images/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://mmech.com/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://mmech.com/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://mmech.com/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mmech.com/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://mmech.com/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mmech.com/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://mmech.com/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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
font_00_sfnt_off00002a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A0B 22400 bytes
SHA-256: b5f54551b537f67a7b2abcfe87a3a74e941e5e7aa32ea853ef30e43c74545fe5
font_01_sfnt_off00005bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCD 19292 bytes
SHA-256: 54df6ab7cbd8da040d3fc0d471fd38ed670923c029d75c86ffa3c2631ce9a33c

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