Malicious PDF — malware analysis report

Static analysis result for SHA-256 26da071b68284a20…

MALICIOUS

PDF

39.6 KB Created: 2020-09-03 05:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b41b7aaa68f6478b888491c3d9557469 SHA-1: 72529bddaf1aa180be7932d3f45e0caf0cce0f29 SHA-256: 26da071b68284a209fb4618f8c8e44c71057cd21037268acb1349fb1d8e043c6
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 static.usrfiles.com, but the primary malicious link is a redirector. The document body text, though heavily obfuscated, contains the phrase 'Infamous paper trail guide' and the malicious redirector URL, suggesting a lure to a phishing or malware distribution site. The PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics confirm the presence of malicious and numerous external links respectively.

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.link/wix?keyword=infamous+paper+trail+guide
    • https://static.usrfiles.com/ugd/735189_cd23d64854c7413ba446c73e7323dc7c.pdf
    • https://static.usrfiles.com/ugd/345929_f59a1b8058384ae8b94fcff253a9fbab.pdf
    • https://static.usrfiles.com/ugd/b8c837_78e3fc5d00d94c9bac31901b4132a2a7.pdf
    • https://static.usrfiles.com/ugd/e3834b_af5f037757c941f6b3d2cebd9fea3235.pdf
    • https://static.usrfiles.com/ugd/a01749_2a5d1af482e945e789714be0ce799adc.pdf
    • https://static.usrfiles.com/ugd/e6092c_4a28c79b7f304778ba92ac1265d4ff75.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceddf993e4b54ec79a7a96f85822c09f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dcd38eafd6a41e98a63dd022eb47498.pdf
    • https://static.usrfiles.com/ugd/353d00_2fa3bec652e14be09bdfc8c5db225c97.pdf
    • https://static.usrfiles.com/ugd/33a2e4_358da36f78d64dadad67038dca2f71f6.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_7cb97c3273974ac3a0c212e96c47178d.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_off00005978.bin
fea24dd830107be6edf3f5902efd28086a28abc70a88b9904deee17bb4af0b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5978 5296 bytes
font_01_sfnt_off00006b68.bin
a51542f954dc0a5f14edd87cddf4e474d814f738f88d22ef83d263f1ebae5e69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B68 11996 bytes

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