Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7596aa52b8f5645…

MALICIOUS

PDF

57.5 KB Created: 2020-08-29 12:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba9710a4bd8119680de294b7b4e3505e SHA-1: 3e65db9072ae168e4ffe37fc96bad477ee8e7f30 SHA-256: b7596aa52b8f5645c6847d28b52fa9d65addcce7a7c9e231073132e248116c06
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'Dell 1720 user guide'. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating an attempt to drive traffic to potentially harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=dell+1720+user+guide
    • https://static.usrfiles.com/ugd/b8c837_6b93a5aa4ae34d488520c5d7e24e6090.pdf
    • https://static.usrfiles.com/ugd/b8c837_b65c760b31a648a095036790a0873184.pdf
    • https://static.usrfiles.com/ugd/b8c837_500b4c203a30405fa7e34697817d959c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9af0223be4134b44aeaca6abddd61bdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/kofufetefarexogazuju.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/50092772234.pdf
    • https://cdn.shopify.com/s/files/1/0431/6417/2445/files/62741727897.pdf
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/filolizoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/kogowofefamewamopuzo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9958/6714/files/font_awesome_icons_css_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/ibm_aix_certification_dumps.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_off0000a197.bin
e888267830c6cd43850f16bc3a2e84217dd4d72ab453387430dbf4ad1f23c3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA197 5188 bytes
font_01_sfnt_off0000b359.bin
2742c82567eca84ab6a5d6b5f76b3cbfc2aa6bf4dd72319c4e37d582140600b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB359 10972 bytes

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