Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c107cfc2921ff3…

MALICIOUS

PDF

35.6 KB Created: 2021-06-21 04:03:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bc12af6423246011acffe2736354e20e SHA-1: d21a000129b1be51485912f482b2ebd678ceaa22 SHA-256: 67c107cfc2921ff3be1cff294aed90723420c603a308879eefdbbfd272c66541
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to external websites, many of which are associated with malicious redirectors and game-hacking lures. The document body explicitly mentions 'How To Change Your Roblox Username For Free 2021' and includes URLs pointing to similar game-related content, indicating a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

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 http://netcdn.co/app/431946152/how-to-change-your-roblox-username-for-free-2021-game-hack In PDF document text
    • http://firesafetyservices.biz/images/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • http://firesafetyservices.biz/images/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-cheat-on-roblox-murder_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-with-points_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/roblox-cheat-engine-patch-bypass_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/roblox-meep-city-money-hack_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-coins_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-no-mobile-number_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
font_00_sfnt_off00003186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3186 22468 bytes
SHA-256: e9ebff273036b75d50e1b879e3c0722b1b5d6c9948d38f1fdcd6c61c4e1aad15
font_01_sfnt_off00006386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6386 19944 bytes
SHA-256: 58d5e835659902526c12094ddffc5710f83fbe2825a8f92a51b056a6b9134250

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