Malicious PDF — malware analysis report

Static analysis result for SHA-256 35aa6967fb952125…

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 12:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb2394333e71b5c35646389d86193d9d SHA-1: 1e306d72035afce5f9b2a8303cd9a484d4eeef41 SHA-256: 35aa6967fb952125f345a6bb8b1321cc28b003ba544f6e0f1a443cb2759aa702
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many of which point to a redirector URL known to host malicious content. The document body, though heavily obfuscated, contains the primary malicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to redirect users to harmful sites.

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=promeris+pas+cher
    • https://static.usrfiles.com/ugd/6f53d7_74f493059acf494886d531f1ee3d6549.pdf
    • https://static.usrfiles.com/ugd/b8c837_736f5ea4b2b1488188eed9c4b98ec757.pdf
    • https://static.usrfiles.com/ugd/eb4c03_d5b189739a51467fb15d54369ec53a3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0595b023874a4e0cb0edad8e125b42ef.pdf
    • https://static.usrfiles.com/ugd/299074_1b1dad0fcadf405088aa811fe5cc72f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9e415945ef84dbeac608134ebf48104.pdf
    • https://static.usrfiles.com/ugd/b8c837_d03c5b973cf44b979260c8ccfe8d9224.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8904/files/sikotavesadu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6625/1677/files/asme_conference_paper_template.pdf
    • https://static.usrfiles.com/ugd/136d07_195f3d8bf6374b9c8e6075167d172fdd.pdf
    • https://static.usrfiles.com/ugd/b8c837_59de6ac12912479a83686689179d656e.pdf
    • https://static.usrfiles.com/ugd/daca0d_b50aca014eb2499abfdc6d3ab5e23aef.pdf
    • https://static.usrfiles.com/ugd/b4609a_1e82b25f075d4c63b908b4b6cac8b6fd.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_off00006183.bin
a5b8d812e5a739038c39d480ba3420e63611954de0a35db06e107b80d36dea35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6183 5140 bytes
font_01_sfnt_off000072cf.bin
f6a59cdf995072c413998ea1313b2d6d1c7fb75d21be85c21a99ae369dafe4c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CF 9736 bytes

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