Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e8797e70a36f3c…

MALICIOUS

PDF

43.1 KB Created: 2021-05-17 06:32:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4908cfee49627b105c3fcbc10a2ea25f SHA-1: ddc157276ce05092ca822df0c9fc7fff976b04de SHA-256: 51e8797e70a36f3c18c3077552068b71807638c1cc4f023dad98ffadb45bef8d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a specific URL in its body, all pointing to websites offering free spins and coins for games like Coin Master and Robux. This pattern is consistent with a link farm designed to drive traffic to potentially malicious or scam websites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-free-spins-and-coins-today-game-hack
    • http://global-tech-security.be/images/how-to-install-minecraft-for-free-on-ios_GM479516143.pdf
    • http://global-tech-security.be/images/how-to-get-free-robux-easy_GM431946152.pdf
    • http://global-tech-security.be/images/juego-hackeado-de-coin-master_GM406889139.pdf
    • http://global-tech-security.be/images/how-to-get-free-robux-2021_GM431946152.pdf
    • http://global-tech-security.be/images/roblox-zone-free-robux_GM431946152.pdf
    • http://global-tech-security.be/images/minecraft-cracked-client_GM479516143.pdf
    • http://global-tech-security.be/images/coin-master-400-spin-link-today_GM406889139.pdf
    • http://global-tech-security.be/images/links-to-free-spins-on-coin-master_GM406889139.pdf
    • http://global-tech-security.be/images/coin-master-free-spins-and-coins-app-download_GM406889139.pdf
    • http://global-tech-security.be/images/google-coin-master-free-spins_GM406889139.pdf
    • http://global-tech-security.be/images/cute-free-stuff-on-roblox_GM431946152.pdf
    • http://global-tech-security.be/images/hack-coin-master-app-ios_GM406889139.pdf
    • http://global-tech-security.be/images/free-coin-master-coins_GM406889139.pdf
    • http://global-tech-security.be/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdf
    • http://global-tech-security.be/images/coin-master-spin-hack-apk_GM406889139.pdf
    • http://global-tech-security.be/images/avatar-de-roblox_GM431946152.pdf
    • http://global-tech-security.be/images/free-coins-coin-master-link-2021_GM406889139.pdf
    • http://global-tech-security.be/images/minecraft-maps-pe-free-download_GM479516143.pdf
    • http://global-tech-security.be/images/free-robux-group-payouts_GM431946152.pdf
    • http://global-tech-security.be/images/instagram-coin-master-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cf7.bin
68801cdb0188b44676ffec011f7c65aa042fc0ebc6651e4023c289f66d17a7c2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF7 24716 bytes
font_01_sfnt_off0000863a.bin
3719491a9c8fefeea03f68de14e56d93a4ff097dba5adf71ae2e44f224446be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863A 18240 bytes

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