Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dcbc6ec0899983…

MALICIOUS

PDF

49.7 KB Created: 2020-08-01 16:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84a1caf632d8523bc41d4ed86b02c76e SHA-1: e6d6e619220b3b357f80fdd9641582971aec75fe SHA-256: d8dcbc6ec0899983c9ad664c9be1d1aeddfa29606171c67351070cdaf6f804f3
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=sample+variance+calculator, which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains references to 'sample variance calculator' and the malicious URL, suggesting a social engineering lure. The presence of many external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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.ru/pify?keyword=sample+variance+calculator
    • http://files.immanuelinabsarokee.org/uploads/1/3/1/3/131380504/4451920.pdf
    • http://files.emilyjholland.com/uploads/1/3/1/4/131454620/d135c84d6c55.pdf
    • http://files.simontoncenter.com/uploads/1/3/1/4/131408798/numefufajolajave.pdf
    • https://cdn.shopify.com/s/files/1/0440/5831/2869/files/vagofagiperarivopurafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8769/9876/files/39562977234.pdf
    • https://cdn.shopify.com/s/files/1/0428/4419/2935/files/34247053083.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/jajaxuxojez.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3507/files/58231511036.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2208/files/3792987676.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72274594547.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/27925938530.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4750/files/fijamusu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4331/5102/files/32428605518.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/
    • https://cdn.shopify.com/s/files/1/0436/4160/2208/fil

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000829f.bin
48cfe4c74bf0cd1f7c269d96360f0b3b1644629d1c7cfdf45a08a1fb738a7ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x829F 5064 bytes
font_01_sfnt_off000093ca.bin
d7aa9acd65c09cdfc3a42200d493ca51b34bdd3a56723287aaec5ee6bacec7bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93CA 11240 bytes

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