Malicious PDF — malware analysis report

Static analysis result for SHA-256 de37b3c6f0888969…

MALICIOUS

PDF

64.1 KB Created: 2020-07-27 09:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15dcfa84fcd8d0897e5648183e73c715 SHA-1: 990d4afa56f914eb121353c25f44a2c8386edbae SHA-256: de37b3c6f0888969f6ce785541bf584795f88db6a2ca855f812ec5c984fd4a14
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'financial accounting interview questions pdf'. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to distribute the malicious payload. The SE_INVOICE_LURE heuristic further supports the social engineering aspect of the attack.

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.cc/wb?keyword=financial%20accounting%20interview%20questions%20pdf
    • http://files.maritzavives.com/uploads/1/3/2/8/132815346/zotowelew_lotavapibo_zevubebesoden_sodagufeje.pdf
    • http://files.thecoachmensclubhouse.com/uploads/1/3/0/7/130739690/5ddd5ad2ea.pdf
    • http://files.norcalpomeranians.com/uploads/1/3/1/4/131437702/f8e984a7d.pdf
    • http://files.crossfit-galveston.com/uploads/1/3/1/6/131607522/xufufarodeg-beraxapuxojebef-murudojivubifa.pdf
    • http://files.perfectprotection.shop/uploads/1/3/0/7/130775949/melizaguxaf.pdf
    • http://files.thecoachmensclubhouse.com/upload
    • https://cdn.shopify.com/s/files/1/0435/0397/6614/files/wibun.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/fepawokorurovizidobogivom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90278046640.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/28147389455.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/69290211880.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21244882445.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8410/files/resajutelinara.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6908/files/17441096384.pdf
    • https://cdn.shopify.com/s/files/1/0431/2711/1841/files/5835738059.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/finoduzobowemapajume.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1369/files/22809793349.pdf
    • https://cdn.shopify.com/s/files/1/0437/7880/1822/files/11236587262.pdf
    • https://cdn.shopify.com/s/files/1/0434/6354/0902/files/22641250868.pdf
    • https://cdn.shopify.com/s/files/1/0434/7261/7637/files/bixewunu.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_off0000bc50.bin
640b48d8c90b60225a8e88a18ecb7a2d4feefae27d9f036c68440949812888c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC50 5436 bytes
font_01_sfnt_off0000cee1.bin
7f8213a9a9bbfad6c8dd5f348e7e4a34719e3eb76cb13f020987618d7e9404b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 10512 bytes

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