Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb5436a106c8198…

MALICIOUS

PDF

39.4 KB Created: 2020-09-02 03:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83a47e34ff44e0e55279a63c33504240 SHA-1: 3dc4c27b6ccb214b90eaef45ea189fbd7f4c92a7 SHA-256: 4cb5436a106c8198f327ed969c40d7b1789e05986bedcaa4ea3c3e18bbc17d29
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains text that appears to be a lure for an 'employee evaluation report'. This link likely leads to a phishing or malware distribution site. The file also contains a PDF link farm heuristic, indicating it hosts numerous links to other PDFs, likely for SEO poisoning or to obscure the malicious redirector.

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=good+employee+evaluation+report
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/calculus_and_vectors_grade_12_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/dozibobuxibolifip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/67935737378.pdf
    • https://cdn.shopify.com/s/files/1/0431/1017/0786/files/make_up_your_mind_lyrics.pdf
    • https://static.usrfiles.com/ugd/a86d68_84694c457e0048c88613c41a7b6c02f8.pdf
    • https://static.usrfiles.com/ugd/d5415a_d1d482b4cd724cf2838a7c372208b446.pdf
    • https://static.usrfiles.com/ugd/b8c837_682d915c828e49ccae42f5eabca10abc.pdf
    • https://static.usrfiles.com/ugd/ac72e0_d06f653a9d4f4c499bc8bf7177a91fe5.pdf
    • https://static.usrfiles.com/ugd/6924eb_2a506997d1ed48b089ecc75891866b3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a275e4d28f764478b9dd137a609f409c.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_off00005d75.bin
482377e9aa3ceb8c72a4b3f811ac811483e775c205d29d87b8c6a72625bd21da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D75 5120 bytes
font_01_sfnt_off00006ed9.bin
a784329a13472b2c7527db3f6641974b05b45b95b249d945bf4d3eed81358c8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED9 10208 bytes

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