Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b94465b6f8b5e77…

MALICIOUS

PDF

49.0 KB Created: 2020-09-01 15:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0a43833613d6807506855d4e5553bb5 SHA-1: 87d87b057504e23009e4c884b9c995d4788601a0 SHA-256: 1b94465b6f8b5e77700998c7e0afd175eef0ba15a64c27e3420d5cdc7e0985fd
150 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is disguised as a 'Bio sample template'. This indicates a phishing or social engineering attempt to redirect the user to malicious content. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. No scripts were extracted, but the presence of a malicious redirector and the document's content strongly suggest a phishing attack.

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/wix?keyword=bio+sample+template
    • https://static.usrfiles.com/ugd/0dcf4b_1111e42334934325b904a06158844738.pdf
    • https://static.usrfiles.com/ugd/aa14a9_84323fdca8e14142a5526e6f01292e10.pdf
    • https://static.usrfiles.com/ugd/b8c837_269a3b3abe3447248be6d613939a3cbb.pdf
    • https://static.usrfiles.com/ugd/c3548c_3e24e8d4d89b449a82d8d83a48da8911.pdf
    • https://static.usrfiles.com/ugd/c1108c_eccb846e0606401d93f2d4651cc61adc.pdf
    • https://static.usrfiles.com/ugd/b6edda_974f052b23c9410ea8b3eb8d10dd29c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1af16ffb28e6454c916cbb9a6fc20157.pdf
    • https://cdn.shopify.com/s/files/1/0440/5847/6694/files/excel_sheet_working_hours.pdf
    • https://cdn.shopify.com/s/files/1/0432/6231/2616/files/gafalilinebuxizaxanufuza.pdf
    • https://static.usrfiles.com/ugd/b8c837_23aa52622ae04cd6862ec580406df94f.pdf
    • https://static.usrfiles.com/ugd/6f53d7_994ca64764094918af0e623f1ed7e9d7.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_67ce84a234a64de9876ac3c5f1d35a1b.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_off000081c1.bin
982e9c038408d48a374691a95cd7d4f07a111c4774eb95c2273bd15dad2125e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C1 4916 bytes
font_01_sfnt_off00009266.bin
070bf8d5fa1416df7015d827b83c1e09115d73d55a067757dc277c3f5ce1b595		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9266 10864 bytes

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