Malicious PDF — malware analysis report

Static analysis result for SHA-256 47fb2e436e0b69f6…

MALICIOUS

PDF

33.7 KB Created: 2021-06-19 16:44:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 02eff56a336e75753d1a4482bd37a870 SHA-1: 616440789b8e5f1cc240811391d50673a70c1748 SHA-256: 47fb2e436e0b69f6f528b60d10af39542105db4ad731aa25e39d1dd25c31f473
122 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which are structured as SEO-optimized PDF gateways, suggesting a link farm designed to drive traffic to potentially malicious download sites. The presence of a critical heuristic firing for PDF_SEO_LINK_FARM and a high ML score indicates a strong likelihood of malicious intent. The document body, though truncated, also contains a URL pointing to a download, reinforcing the lure pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-dresses-for-roblox-game-hack
    • http://perpustakaan.poltekom.ac.id/repository/free-minecraft-windows-10-with-java_GM479516143.pdf
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-spins-for-free-on-coin-master_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/get-free-robux_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/spin-hack-for-coin-master_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/daily-coin-master-free-spin-link-facebook_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-hack-spins-download_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/nicsterv-robux-hack_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/minecraft-free-games-no-download_GM479516143.pdf
    • http://perpustakaan.poltekom.ac.id/repository/codes-for-hacking-in-roblox_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/cute-roblox-faces-free_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-apk-mod-hack-download_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdf
    • http://perpustakaan.poltekom.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/free-coin-master-generator_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-hack-quora_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/free-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/no-scam-free-robux_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/roblox-free-robux-obc-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e9d.bin
bcdd89a5f18e2bb7aa79cd16896f6802b7b54f5f32aa39bc9d4f0b9da603b455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E9D 21904 bytes
font_01_sfnt_off00005f1f.bin
ca9618b5fd7e8771b5192a8950633424d2759e0282869e1c6f8b712cbab819c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1F 18816 bytes

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