Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d17b3a46ce15de1…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 05:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 381d675d1f4d64088bc05a2383e8ca2c SHA-1: 619362e33a2274296c223a8b2f021fa03e42c7c8 SHA-256: 3d17b3a46ce15de19fd07b165dc140163d71b3c46356d52b4f25057b7c0e59b7
128 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, disguised as a 'fake utility bills template'. This lure is further supported by the 'SE_INVOICE_LURE' heuristic. The embedded link redirects to 'https://ttraff.ru/wix?keyword=fake+utility+bills+template', which is flagged as malicious. Additionally, the PDF contains a link farm pointing to multiple PDFs hosted on 'static.usrfiles.com', some of which are also linked from the main malicious URL.

Heuristics 4

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=fake+utility+bills+template
    • https://static.usrfiles.com/ugd/b5aed9_99f4e6327eba4b3ab96d25339db6b31b.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_897dd89201da4cda99a8abd5af553b96.pdf
    • https://static.usrfiles.com/ugd/74e905_c7ff22dfb55142d68142d3920aebd6b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b40ca334f3f34c06ae4f96d28985702b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c692caf4a0a64d8ca1ba09c60602eacc.pdf
    • https://static.usrfiles.com/ugd/ea78e0_aea4d153f292470c8efdf2bd2e0e43b4.pdf
    • https://static.usrfiles.com/ugd/1f2646_681a7d8a7d96490bb70cba52d0e0f632.pdf
    • https://static.usrfiles.com/ugd/a771bd_8cd9de61f87d4b648747dae445686da8.pdf
    • https://static.usrfiles.com/ugd/badafb_c6900691407144869de456bdd57c8fc9.pdf
    • https://static.usrfiles.com/ugd/76156b_96ac741d5f9a4087a88e82e326e9afee.pdf
    • https://static.usrfiles.com/ugd/c1615c_2097de4f71f44608b9dd884590567332.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rojifibopi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58580374151.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_off00006074.bin
26c87538c47679f38722d6ca7a72c393251363a44fb338044d5c816cda396aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 5132 bytes
font_01_sfnt_off000071e3.bin
f0f306d4e2291b5ae3d0eb23d8a0ac588e2a1a77b6f81b2099fd1e2d35bafbf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E3 10632 bytes

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