Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5522f1be21d0ba…

MALICIOUS

PDF

35.4 KB Created: 2020-08-31 06:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a76312ff45bd2fd0999b49841984bf9 SHA-1: 35dfcbf5e44c50e5b9fc79d24b734d01b86b1a88 SHA-256: dc5522f1be21d0ba20a7e27cffd44c5f49d1e3fb3450905834e7f2824c41055a
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used in SEO poisoning attacks to drive traffic to malicious sites. One critical heuristic identified a PDF link to a known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=5th+grade+vocabulary+fill+in+the+blank+worksheets'. This suggests the document's primary purpose is to redirect users to potentially harmful content, disguised as educational material.

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/wix?keyword=5th+grade+vocabulary+fill+in+the+blank+worksheets
    • https://cdn.shopify.com/s/files/1/0437/8004/6997/files/83374554508.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5191/files/asternic_cdr_reports_standalone.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/808020406.pdf
    • https://cdn.shopify.com/s/files/1/0450/6284/8664/files/acord_cancellation_form.pdf
    • https://cdn.shopify.com/s/files/1/0444/2020/2663/files/understanding_machine_learning_from_theory_to_algorithms_free.pdf
    • https://cdn.shopify.com/s/files/1/0463/3113/4113/files/98112790729.pdf
    • https://cdn.shopify.com/s/files/1/0437/0143/6569/files/labrador_puppy_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/4373/4172/files/96194781650.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b8d0798de2a4789a4b0b27ac73622b5.pdf
    • https://static.usrfiles.com/ugd/e4a001_3be3d0632bb64100a201b1758e3d7e3f.pdf
    • https://static.usrfiles.com/ugd/9b33c5_a3de657ad92f4d50aac8bae09c8626fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_faf4b760045644569e9bacd5aefa5609.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/44705113123.pdf
    • https://cdn.shopify.com/s/files/1/0428/7778/0134/files/davokolewajifuloz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3418/9734/files/97234584783.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/jokagub.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/genetics_class_12_ncert.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_off000049e3.bin
bb20ac8a5809cabaab741406bb13702e72ea95592cc041390d02540aa658f9b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x49E3 5772 bytes
font_01_sfnt_off00005da2.bin
11cf94ccef00b75e420f2d21b7a7530231b20c3084094d737eade0eacda3d83d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA2 10124 bytes