Malicious PDF — malware analysis report

Static analysis result for SHA-256 234fcd87dfd0805e…

MALICIOUS

PDF

42.6 KB Created: 2020-09-08 06:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5970224b7fbd85ab0514827fa4f12d73 SHA-1: 14d74d6176669f2f0d00c4272cd680e6ee90e739 SHA-256: 234fcd87dfd0805e9a4ef18652b7e7a8c257589b34d53f3cfd2404c3909d1ba3
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to a URL that mimics an estate tax form application. This suggests a phishing or scam attempt. The document body, though heavily obfuscated, contains the same suspicious URL and references to PDF files, reinforcing the lure. The presence of numerous external PDF links, many hosted on static.usrfiles.com, indicates a link farm designed to obscure the true malicious destination.

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.club/wix?keyword=deceased+estate+tax+file+number+application+form
    • https://static.usrfiles.com/ugd/a32c20_98c585ea02cc4850bc1ebb7d356e003e.pdf
    • https://static.usrfiles.com/ugd/1c90dc_09414bef5788409895673bfa35cffca1.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_87c99d51c6d44f79bd4347365a5a526b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e9739adb50e479a87f65fc5b70b1637.pdf
    • https://static.usrfiles.com/ugd/9421c8_dcd11707e17c4457a218d40859e27d7d.pdf
    • https://static.usrfiles.com/ugd/7f614e_3e527c9421024131842d3aa43490d3c9.pdf
    • https://static.usrfiles.com/ugd/db93e9_d23a1c66662940b1ab0899123090534f.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1001/files/23414217012.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9351/files/rebelion_de_la_granja_libro.pdf
    • https://cdn.shopify.com/s/files/1/0435/7737/6936/files/62771436521.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/rotelamanavora.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/corporate_finance_11th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/1854/2504/files/date_format_english_american.pdf
    • https://cdn.shopify.com/s/files/1/0436/9468/6376/files/risoxidatidibavag.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_off000067a5.bin
5797cd47199f270f8b7096ad7d8fa6057a139e052fec031d716431b1d16bd3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A5 5508 bytes
font_01_sfnt_off00007a4b.bin
47db81eef8808b5f0c12a0dc69b9b6b4b554cec8c74d22e7c41eee51c6f01e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4B 10472 bytes

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