Malicious PDF — malware analysis report

Static analysis result for SHA-256 8283e874abf35cbd…

MALICIOUS

PDF

36.7 KB Created: 2020-08-31 12:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96f35d58673e087b81eeb961c99272a6 SHA-1: 7a8d9f383549ba51dd301b436c884ddc11eb5789 SHA-256: 8283e874abf35cbd141544696d5d009e88ebd0ceba99a7d5f8077fce7797ec73
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or redirection attempt. The primary malicious URL identified is https://ttraff.com/wix?keyword=embriologia+humana+pdf+libro. While many other URLs were extracted, they appear to be benign hosting locations for PDF files, likely part of the link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=embriologia+humana+pdf+libro
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/mofufupurozafimokififo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5748/7778/files/20615248558.pdf
    • https://cdn.shopify.com/s/files/1/0440/9003/2278/files/aeronautical_study_in_annex_14.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7b557e2baab4bf5881c387455893c6a.pdf
    • https://static.usrfiles.com/ugd/921909_270bae996f9e4ae0bca5c7f9128947ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_879096ab34394befbb45a06787a03215.pdf
    • https://static.usrfiles.com/ugd/48f461_7939ec7efb00453f9c7e3a04f34496af.pdf
    • https://static.usrfiles.com/ugd/921909_799c4d7f97c14d3997eb38075240fbcf.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_off000052b2.bin
5d2eee2f601a2d6f5b29a99eca9cc2a834342b4ae1abfb7bf568c707d512988a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52B2 5376 bytes
font_01_sfnt_off000064cd.bin
d9f90c8f8784cfa9644435e281559d24b9999bde3533d2a2eb2e73b947c87cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CD 9952 bytes

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