Malicious PDF — malware analysis report

Static analysis result for SHA-256 285b965e1cf3e216…

MALICIOUS

PDF

45.4 KB Created: 2020-08-31 01:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40c2ab9b69a64ed0fcee4dd1fdb5d9e1 SHA-1: 276380b6232b5c1cec5379eac2fba2e9568f0bfa SHA-256: 285b965e1cf3e21650c4fa5ced64681006530dd2bb7ade9faa0ef178d07988bd
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic indicating it's a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=2nd+grade+reading+comprehension+worksheets+multiple+choice+pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The primary intent appears to be redirecting users to malicious infrastructure.

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.cc/wix?keyword=2nd+grade+reading+comprehension+worksheets+multiple+choice+pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5883/files/haynes_weber_carburetor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0462/7949/1733/files/puratifesixajokavufi.pdf
    • https://cdn.shopify.com/s/files/1/0466/6402/4229/files/lotakuvofijamasutifaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8980/files/nuwaxovipubometozebimafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/wawisiburorilizuremuli.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/76195273319.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9283/files/assentamento_funcional_digital.pdf
    • https://static.usrfiles.com/ugd/b8c837_54b08894991047e582f1b28c977478ce.pdf
    • https://static.usrfiles.com/ugd/f14cf6_77d431e61be240359ce0762a9ce770c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dae6cf70624488d80d3fba796d71520.pdf
    • https://static.usrfiles.com/ugd/97493d_fd1d0aa23a2945ffb9693276a5a99dab.pdf
    • https://cdn.shopify.com/s/files/1/0435/6951/2607/files/kambal_katinig_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0452/5775/2733/files/riwobinezubuxalanok.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/24141166884.pdf
    • https://cdn.shopify.com/s/files/1/0433/3669/5959/files/rectification_deed.pdf
    • https://cdn.shopify.com/s/files/1/0440/5064/5157/files/23924339192.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_off00007289.bin
68fdf9be9333009bfe09205d8347e7570987cc88f45a26572d04801368c7207a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7289 5760 bytes
font_01_sfnt_off00008600.bin
ac5ef3709ddf2dc118efe06f6402de2b73adbbe9e9d392f5838c13a3c63d1549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8600 10080 bytes

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