Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fe1044969790d9…

MALICIOUS

PDF

40.4 KB Created: 2020-08-18 22:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ea33f3d5b55f68beb286fd1d9f6de61 SHA-1: 42bd3dd179083a5c761bd5ae685a2c5feaee7df4 SHA-256: 42fe1044969790d977368201b79e9513b587158d13b8d9f4fa3ca58393eceed5
128 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'free daily cash register balance sheet' and mentions 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing strongly indicates the document is designed to redirect users to a harmful site. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, likely for SEO manipulation or to host 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.cc/pify?keyword=free+daily+cash+register+balance+sheet
    • http://wamoto.volleytech.ca/uploads/1/3/1/3/131383657/8843347.pdf
    • https://cdn.shopify.com/s/files/1/0440/1568/1701/files/ancient_rome_map_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/6533/4165/files/anatomy_drawing_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/3542/5944/files/91008456446.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/51216505668.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/16842385895.pdf
    • https://cdn.shopify.com/s/files/1/0435/4880/3227/files/pisominenasivibuxidur.pdf
    • https://cdn.shopify.com/s/files/1/0428/5687/4151/files/kuropijajofapusidulozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/57323776819.pdf
    • https://cdn.shopify.com/s/files/1/0436/9190/1081/files/fulafufafixedugimib.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/kesujesalemejiwemasef.pdf
    • https://cdn.shopify.com/s/files/1/0435/7950/6847/files/16827683936.pdf
    • https://cdn.shopify.com/s/files/1/0434/1356/9690/files/41658788382.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_off00006043.bin
8516fa16980d5be47a434868df42e45f41b02e2ff962425a8732e8e2374e2686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6043 5400 bytes
font_01_sfnt_off00007297.bin
e2df01c52bab4cb722a397d187f3348b7fd3d1ec24e910495beaa60ba256537e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7297 9856 bytes

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