Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c1950193c0f463…

MALICIOUS

PDF

34.3 KB Created: 2020-08-29 23:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd3577672be761210cb898a7435767b9 SHA-1: cfcdbdc4c058f1f8dec71263e7febe2b71fa25ff SHA-256: 52c1950193c0f463c813de524367ab6597614be76f6e7b53bcb3db73e8863d63
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, constituting a link farm. One of these links, https://ttraff.ru/wix?keyword=subject+filing+definition, is flagged as a malicious redirector. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the malicious redirector and link farm strongly suggests an attempt to lead the user to malicious content.

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.ru/wix?keyword=subject+filing+definition
    • https://static.usrfiles.com/ugd/b8c837_8240c5e5019940c4b2de46f355e3afa8.pdf
    • https://static.usrfiles.com/ugd/b8c837_04575e3c877248a19f699182ba6cc4b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e13da048f9344248bcfe33ac53382547.pdf
    • https://static.usrfiles.com/ugd/b8c837_4263e917e5ab430bbce7e8548f6d2abe.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1ac3b661c8f48688e38482448d49d01.pdf
    • https://static.usrfiles.com/ugd/b8c837_312504d1cf2d44fcb4f3b3d8e2ce6d74.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/bikum.pdf
    • https://cdn.shopify.com/s/files/1/0441/3738/2040/files/aetna_better_health_of_pennsylvania_appeal_form.pdf
    • https://static.usrfiles.com/ugd/b8c837_39b70d8bed95487c88a558d717dc91f5.pdf
    • https://static.usrfiles.com/ugd/ba3095_2de2cf17ab7744d494120324d6657860.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_off000049e1.bin
852cf652ca714ef7f22107452391fda314a4a62647aefedaf02890ebd0e37908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49E1 5024 bytes
font_01_sfnt_off00005b09.bin
8f529abc2fc962bfe08ee2c9646471e1b7145599bc48b056382422a555cfbcce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B09 9928 bytes

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