Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ae11fd1d056bdf…

MALICIOUS

PDF

43.9 KB Created: 2020-08-31 21:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6998990b70d0d0bb4ae8dc8f1a091e8 SHA-1: 982b1b80f628263b85e8ce3138ee9cdc8060045f SHA-256: b8ae11fd1d056bdfe530effe8bb18f2fa74f5f421a1e6c52b944e0a41ded91b2
128 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, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'wholesale agreement template pdf' and the authoring application 'wkhtmltopdf', suggesting a lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.com/wix?keyword=wholesale+agreement+template+pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/logifovutulakawewugaxeku.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/13109617697.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/73263363638.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/fabekokixan.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/telugu_movies_2018_jio_rockers_3gp.pdf
    • https://cdn.shopify.com/s/files/1/0433/6563/0102/files/cuestionario_de_afrontamiento_al_estres.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/ielts_speaking_topics_files_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/40620669719.pdf
    • https://cdn.shopify.com/s/files/1/0437/5258/7415/files/78005482551.pdf
    • https://static.usrfiles.com/ugd/d55797_8b449f335ed1414490eb66808e4e3700.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4f0c95c0cfc47c3ad749529c535000e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f46307689d54debacfec8c14670a98d.pdf
    • https://static.usrfiles.com/ugd/b8c837_41741e7f48c141b7bf49d0f3b2fdd660.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_off00006a31.bin
b6f1d64874521b8b4eab9abd9caec16f65e32513bfcfa30f5c8ed7758d335b60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A31 5468 bytes
font_01_sfnt_off00007caf.bin
74cc79f812ca36a43c0c208049c8b5b5045aa790dde97b198463afb3d259d775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAF 11708 bytes

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