Malicious PDF — malware analysis report

Static analysis result for SHA-256 9839d75605882756…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 18:39:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 647956b4efa12c9ffbbdf022885ced22 SHA-1: ecfd8adfe85bf816b7ecd29ae848814a37477243 SHA-256: 9839d756058827569f1297b94d7d130a62af895fe681ab261a6ea1ea8342f5f7
120 Risk Score

Malware Insights

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

The PDF file contains a link farm and a critical heuristic firing for a malicious redirector. The embedded URL 'https://ttraff.ru/wix?keyword=avira+free+antivirus+android+chip' is identified as a malicious redirector. Additionally, numerous links to PDF files hosted on Shopify are present, suggesting a SEO link farm tactic. The document body, though heavily obfuscated, contains keywords related to antivirus software, reinforcing the lure.

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/wix?keyword=avira+free+antivirus+android+chip
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/wapabemepuro.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/certificate_of_origin_form_a_issued_retrospectively.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/19474489195.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1ccccb3e0484a8fbc947a367d1542cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_9de39514f661457f85d44fcf7b7d49b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc7f93e8b811467cb0ed3ad494484435.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/12795130299.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/midobolexudosawu.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_off00006f56.bin
8a8771f9572b2d8247dc31e5bb550d5278de8e5058d00dbd35e06836e5ec811f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F56 5260 bytes
font_01_sfnt_off00008141.bin
7f30c297766138f48129754cb75c4337070735d80ab882420320d02056782542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8141 10600 bytes

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