Malicious PDF — malware analysis report

Static analysis result for SHA-256 c138ccd1e4b8b42c…

MALICIOUS

PDF

53.8 KB Created: 2020-08-31 09:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67ede0c6248651fca3ead0f1429dabce SHA-1: 511de1f51ea95122cd7e5c799ebd01678fc694d7 SHA-256: c138ccd1e4b8b42c4c0c86cde30a6bb67a040f58b317c56deec2a981c18046a5
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic, indicating a link to known malicious infrastructure. Additionally, a PDF_SEO_LINK_FARM heuristic fired, suggesting the document contains numerous external links, likely for SEO manipulation or to distribute malicious content. The primary IOC is the redirector URL, which is likely the initial step in a phishing or malware distribution chain.

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=android+butterknife+onclick+multiple
    • https://static.usrfiles.com/ugd/217d68_fcda848eea834d878f0f563f40b535f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_51fe41c0722f429dbb50cc7821b345d2.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_690d85d665354a04b83dc6851be157bd.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/usda_dietary_guidelines_for_older_adults.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/berliner_platz_4_neu_intensivtrainer_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/30494952051.pdf
    • https://cdn.shopify.com/s/files/1/0436/6427/7657/files/maforafewupobijara.pdf
    • https://static.usrfiles.com/ugd/0049ca_2fd4f9009712430398b4656eb22d3678.pdf
    • https://static.usrfiles.com/ugd/a01749_a01ac6f41bda431d9c7c73f447f62709.pdf
    • https://static.usrfiles.com/ugd/b8c837_0efd68cc3fe24744b35c38ce4ea5545d.pdf
    • https://static.usrfiles.com/ugd/3ce946_63495e291d8f4325af08ea090397436d.pdf
    • https://static.usrfiles.com/ugd/97493d_b1f317f802f44fd4b78f350b542cc4f6.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/63778037683.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/kisixinas.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_off00008864.bin
19ca6af990520ef9f1e254e51c809c8d8cc1f371e25751c891de3a8c76ba89e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8864 5104 bytes
font_01_sfnt_off000099ab.bin
35cf46002e0dfcd7116a6af79b44f60eafdbd7bba1a0b244ff961c432db0fe89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AB 15376 bytes

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