Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb5e064f29798a2…

MALICIOUS

PDF

41.9 KB Created: 2020-09-03 22:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83e7e06c3bca963a0e32f8e495e67ac2 SHA-1: 0dc8945ec824f5e8482382ae3cbef2e40485d828 SHA-256: 3bb5e064f29798a20415de416156a2b6c79dfb91856ba6b499d3f9c1bba8b591
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=java+compiler+free'. This URL is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The primary malicious URL is the most critical IOC.

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=java+compiler+free
    • https://static.usrfiles.com/ugd/6c032c_520f0ad18e5e4f4baaee1d0f3a2e6a41.pdf
    • https://static.usrfiles.com/ugd/daca0d_7211d275de65419e84131eae2a0f29c6.pdf
    • https://static.usrfiles.com/ugd/fc840b_0d42339529584381bb91d17059ee4fdb.pdf
    • https://static.usrfiles.com/ugd/74a852_9cdc680812be4d2abf4272dd963c4a51.pdf
    • https://static.usrfiles.com/ugd/b8c837_179209e83ce24ee09f428c79ba82157d.pdf
    • https://static.usrfiles.com/ugd/b8c837_440114f5513f4854b313b69758118795.pdf
    • https://static.usrfiles.com/ugd/144d27_e82dc34dee934264b49677d764287d40.pdf
    • https://static.usrfiles.com/ugd/b8c837_09075c5abb284f6eb5ad2269ce3bf47e.pdf
    • https://cdn.shopify.com/s/files/1/0428/4098/1670/files/1426810862.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/54704990996.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/86280843895.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_off00006778.bin
e6415d029a1e04c7dcbb80e2ac32be7eda349494fcdb88be3528da03e78b3e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6778 5032 bytes
font_01_sfnt_off00007891.bin
8acb0edf1fc495ef6714c62e7af7eaf55facb1e5a21c34aa51d57e33cc87ae46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7891 10128 bytes

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