Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e69a1a0802a3e8c…

MALICIOUS

PDF

35.3 KB Created: 2020-08-06 05:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a96eb7788c63cddb3407ab526e25e240 SHA-1: 312aae4f8a1b91b355d9b71a82beb0b49435ceb3 SHA-256: 1e69a1a0802a3e8c7f4b3e5257a47e286ff76ea4580c2153869d8e1c78daa745
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=statistical+methods+freund+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=statistical+methods+freund+pdf
    • http://files.studiodig.com/uploads/1/3/1/6/131607053/3895137.pdf
    • http://files.antikapictureframing.co.uk/uploads/1/3/1/3/131398046/9b996.pdf
    • http://files.danburyneighbourhoodplan.com/uploads/1/3/1/3/131383743/beveraj.pdf
    • http://files.rawpetsrule.com/uploads/1/3/0/9/130969855/takisebekozi_deriloxozi_jasedamotobef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdf
    • https://cdn.shopify.com/s/files/1/0432/6634/3072/files/14419256731.pdf
    • https://cdn.shopify.com/s/files/1/0440/6706/1910/files/nomination_committee.pdf
    • https://cdn.shopify.com/s/files/1/0430/1638/8761/files/55685491761.pdf
    • https://cdn.shopify.com/s/files/1/0438/3460/5728/files/ziwivosezukusolixa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7099/files/bunivibegipopaki.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/43530939045.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/47343676403.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/84869035877.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/jasexatepudapuga.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_off00004c6d.bin
fd57c85c2e20e94885de13a8a4b5b49b0bf7f05bdb4efa5e243e5b3bbc406073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C6D 5500 bytes
font_01_sfnt_off00005ef0.bin
7a77cd3fb8ba7c7290130a9a845591bcfaf6275918a9f0fbc15258817fdc3f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF0 9876 bytes

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