Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de75bfb611f70e6…

MALICIOUS

PDF

32.8 KB Created: 2021-07-20 01:33:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5193185744b75773b695b2897d3f9d23 SHA-1: 9bfcd8185f27177024b93552565dc95e23e6376d SHA-256: 4de75bfb611f70e620c77eb967067c3c0d8cef51514b476309a08aaa820ed500
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free Robux' or game hacks to entice users. It contains multiple embedded URLs that point to redirector infrastructure, which is a strong indicator of malicious intent, likely leading to further malicious downloads or phishing pages. The ML classifier also flagged this document with high confidence.

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/free-robux-no-verification-or-survey-game-hack In PDF document text
    • http://fradiomas.com/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://fradiomas.com/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://fradiomas.com/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://fradiomas.com/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://fradiomas.com/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://fradiomas.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://fradiomas.com/images/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://fradiomas.com/images/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://fradiomas.com/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://fradiomas.com/images/get-free-likes-on-tiktok_GM835599320.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_off00002a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A4C 22268 bytes
SHA-256: c2ad00d94f4ea6125473e65291d996704ac7f4bc47d3606dee053b52be942a25
font_01_sfnt_off00005ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA2 19080 bytes
SHA-256: 639f8102a1b831e35f5cb6da0b764cfab857c828cdece95449e85bc92486dc91

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