Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89e09645d237bd6…

MALICIOUS

PDF

32.1 KB Created: 2020-08-16 13:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ad8a75b3a88db5faedf5fed9bb644a5 SHA-1: 433d5cd862f6a4070af7bb97fa14ce7f9e96abb9 SHA-256: b89e09645d237bd689d4378308917167ffcf8f6c2c84a0c2d1e0ca4405e21348
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary redirector URL being https://ttraff.ru/. Many other links point to Shopify domains, suggesting a link farm or SEO poisoning attempt to obscure the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=merrill%20advanced%20mathematical%20concepts%20precalculus%20with%20applications%20pdf
    • http://files.thegumboshack.com/uploads/1/3/0/9/130969472/2304338.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/29471589404.pdf
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/xupanunikorasadabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9066/files/92464433068.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/lejur.pdf
    • https://cdn.shopify.com/s/files/1/0433/1657/6424/files/52031072637.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/victor_cheng_loms.pdf
    • https://cdn.shopify.com/s/files/1/0452/6276/6242/files/3124758429.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1712/files/maberepuje.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/tojibaxolabeju.pdf
    • https://cdn.shopify.com/s/files/1/0450/3116/2006/files/convert_word_document_to_fillable_form.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_off00004149.bin
8314b84e6f3dc091ae939c25e2cbb1e5eec2b1783dd6ebc02667e61221be62d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4149 5552 bytes
font_01_sfnt_off00005415.bin
13917e80ee7bd2c2288d0b77f44594f97bd64b75b3b2224cf25c68036e69ef30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5415 9088 bytes

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