Malicious PDF — malware analysis report

Static analysis result for SHA-256 f673e1b2583d57a4…

MALICIOUS

PDF

29.6 KB Created: 2020-09-03 01:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2ef47a8394899382c7ced3664b4669f SHA-1: c2025f16ec31a027b2e2045ac79829fcd2583591 SHA-256: f673e1b2583d57a42ee41cfd20ad66ac40cc7c85e8ea51f0315ba19c5d84199c
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, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The primary attack vector appears to be a link farm designed to redirect users to malicious infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=sentence+or+fragment+worksheet+doc
    • https://cdn.shopify.com/s/files/1/0438/1917/2000/files/40238178768.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/38478454704.pdf
    • https://cdn.shopify.com/s/files/1/0431/1348/0343/files/mukovefaritaruvatagu.pdf
    • https://static.usrfiles.com/ugd/91e123_d69c11c5f6d34e8d87d62e9739d94cfd.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/57305388537.pdf
    • https://cdn.shopify.com/s/files/1/0429/4675/6774/files/gastritis_cronica_tratamiento_nutricional.pdf
    • https://cdn.shopify.com/s/files/1/0437/4721/3464/files/19447153431.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/68815965153.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_off00003a5b.bin
a894270d0e75acce060ec628a11ea153442eb4ad09ded2441b4d6ccab4dcfac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3A5B 5660 bytes
font_01_sfnt_off00004d8a.bin
658936e73635d200676f2e30b19fb192fb22f0e4bd8bcc727d2536b12273352e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D8A 8472 bytes

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