Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5938fe5e1a5e19e…

MALICIOUS

PDF

38.8 KB Created: 2020-08-31 15:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 728e222eaf323fc562ea28ba37da6056 SHA-1: efd592c3cf24b070073d9d0970b793bf60ea21de SHA-256: f5938fe5e1a5e19e31810037ebefccce8ecef9f78b8088dc1e65e22635c2dbca
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used for SEO poisoning or to distribute malicious content. One of the embedded URLs, 'https://ttraff.com/wix?keyword=apr+performance+front+wind+splitter', is flagged as a known malicious redirector. The document body itself is heavily obfuscated but contains this URL and other links to PDF files hosted on static.usrfiles.com. The presence of a malicious redirector link strongly suggests an intent to lead the user to a harmful 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.com/wix?keyword=apr+performance+front+wind+splitter
    • https://static.usrfiles.com/ugd/b8c837_db409db4f6a241769f915350bc4ae4e7.pdf
    • https://static.usrfiles.com/ugd/60933b_bedabbe521f54e8493e0b10ac10569ed.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_bc108e60710b4bce8b862b89076c0402.pdf
    • https://static.usrfiles.com/ugd/0d089b_b17082f01d364b978339e715f307efd8.pdf
    • https://static.usrfiles.com/ugd/93c935_73d64171b7614429bf3e789187b0ebba.pdf
    • https://cdn.shopify.com/s/files/1/0435/1010/4228/files/27571104472.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2931/files/affirmative_and_negative_sentences_rules.pdf
    • https://cdn.shopify.com/s/files/1/0435/0204/3288/files/basaglar_package_insert.pdf
    • https://static.usrfiles.com/ugd/12f4eb_23e85f6b48804d4687e1a876015cf0b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c44405b3f47f411096c8036deed1dd57.pdf
    • https://static.usrfiles.com/ugd/b7ed05_ef3f85d74dbf4a7e89a35c4fb329ed6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e3cc7ffee334471b73d94ae21f8de02.pdf
    • https://static.usrfiles.com/ugd/2c608b_f413940bfb7f44ed9a554789acb2b589.pdf
    • https://static.usrfiles.com/ugd/b8c837_0386f3b8c84d4403ae92a649a43a33dc.pdf
    • https://static.usrfiles.com/ugd/01e791_e199fe2be76d40ab9ffba588645cbe53.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_off00005ae9.bin
f35b4f36fa1ffc89292d95cdd53cf21315286d324239c4eaa36161f8fefd63d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE9 5384 bytes
font_01_sfnt_off00006d32.bin
14d39b55896246876354cd75a908b6eaaa3acdc45e88b6f1456d54342cc8b472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D32 9824 bytes

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