Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde2a53db191dfde…

MALICIOUS

PDF

42.8 KB Created: 2020-08-19 11:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01aa4a055e72e7495dd61ac3a3857c0f SHA-1: 1a990642cc0cde370916c90a1d190f2d3a64992d SHA-256: fde2a53db191dfdec4717efcf5357dc7cbaf8eb09c050b4949ba6746f2d9a40b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute content through numerous links. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.
  • 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://ttraff.com/pify?keyword=ffxv+melusine+guide
    • http://fusutomo.bluebonnetshophop.net/uploads/1/3/0/8/130874524/vuguxipo_fiwevopuwe_sevitejiber_jagakama.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4940/files/99217720934.pdf
    • https://cdn.shopify.com/s/files/1/0437/9118/8117/files/47265413558.pdf
    • https://cdn.shopify.com/s/files/1/0440/1122/5246/files/65149430992.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/50137985462.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9443/files/converter_box_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/70726620065.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5236/files/63512497561.pdf
    • https://cdn.shopify.com/s/files/1/0437/2725/7749/files/51452512413.pdf
    • https://cdn.shopify.com/s/files/1/0437/5625/7441/files/34678011417.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/16527849047.pdf
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/ladomesusaroxukeko.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1220/files/scientists_tools_list.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b35.bin
8f9a2a058d2c80a48c71ae2a7ec07e659d384b7e9654e20c435a9fadb660d820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B35 5004 bytes
font_01_sfnt_off00007c3e.bin
fd5be8be1fec7b3fff9e65823ec007cb4603daa533cc3b94ca41f9ed8c326924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3E 10192 bytes

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