Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73bcff07239586b…

MALICIOUS

PDF

40.7 KB Created: 2020-08-17 11:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b54883499fee9db37bad53289d80b9d3 SHA-1: 403860bf61f16985b9c42028b56c0f7dcea96412 SHA-256: b73bcff07239586b7f867c65b6d8b1f9b96cb6e1c4a22d49f9a21875ffc750d4
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document body and heuristics indicate a lure related to 'varnish software free'. The PDF also contains a large number of external links, many hosted on shopify.com, which is characteristic of SEO link farm techniques used to obscure malicious destinations. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/pify?keyword=varnish+software+free
    • http://botuvurig.warandthecanadianexperience.com/uploads/1/3/0/7/130739655/e791851d9c16.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1253/files/sheet_silicate_structure_definition.pdf
    • https://cdn.shopify.com/s/files/1/0447/0312/1562/files/1175732553.pdf
    • https://cdn.shopify.com/s/files/1/0432/1355/3827/files/fiendish_codex_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/4105/4111/files/quantitative_financial_risk_management.pdf
    • https://cdn.shopify.com/s/files/1/0432/7401/0782/files/aba_autisme.pdf
    • https://cdn.shopify.com/s/files/1/0428/8570/9987/files/rewirosowati.pdf
    • https://cdn.shopify.com/s/files/1/0434/2985/5393/files/womunusobikare.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/wukenoluwamasitokejanede.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0433/0648/3876/files/incentive_pay_definition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005329.bin
95efed52d7ef89ce6a4b65420e53329a1af8c5414d46c04a0908aa5265a8678e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5329 4668 bytes
font_01_sfnt_off00006302.bin
cce5547441a67bb1a1b331f62c206ed6aa394e393f4b34323d4296ace0306a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6302 11016 bytes
font_02_sfnt_off00008865.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8865 4324 bytes

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