Malicious PDF — malware analysis report

Static analysis result for SHA-256 188d776bf10def4f…

MALICIOUS

PDF

34.1 KB Created: 2021-07-02 03:49:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 42c6dc6e06f19e027592d4b8edaa3e83 SHA-1: 6aa388e88dc6e337a14b6567c1e847b742fe6373 SHA-256: 188d776bf10def4fd196e5bd78061cd91c19f938f2d2bf4edcdfe0d7f4cb4f1b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to external files hosted on siahotel.com and netcdn.co. These URLs are related to game cheats and in-game currency for popular games like Roblox and Coin Master, suggesting a lure for users seeking such content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the document's structure and URL content point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.co/app/431946152/group-roblox-free-robux-game-hack PDF link annotation
    • http://www.siahotel.com/userfiles/files/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-rhs-cash-in-roblox-high-school_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/hack-roblox-click-tp_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-vip-roblox_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/is-roblox-100-cheat-ingine-patched_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-to-get-free-robux-without-getting-banned_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/roblox-robux-page_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_off00002f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F03 22244 bytes
SHA-256: 574ce1fbfe37864148798fbea7320267945502af450d689a51724b8bf06b89c2
font_01_sfnt_off00006067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6067 18968 bytes
SHA-256: 5d85181520b6881fb10db3b0f2c217e240d0a9b69a06780cc0faf344fc6116ea

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