Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cdb5fb0b24f0fe…

MALICIOUS

PDF

39.5 KB Created: 2020-08-29 14:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa8b44eb918525ac7c83ade2e68c76e6 SHA-1: e460fd835774aaced67e8d90a57cb6f0b51de25d SHA-256: a5cdb5fb0b24f0fe1afae8e8c82b9acf93f0e401eff207d435ebb83be55210f4
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of these links, https://ttraff.ru/wix?keyword=swank+audio+visual+services, is identified as a known malicious redirector. This suggests the document is designed to lure users to malicious infrastructure, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=swank+audio+visual+services
    • http://www.swankav.com/
    • https://static.usrfiles.com/ugd/b8c837_ef2bd8778cf849fd9c7f220d72f0503f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1f5b1fa30ce44ba83c8e0dccb73199b.pdf
    • https://static.usrfiles.com/ugd/b8c837_527e1dd520674f53a0cf9c4579a140c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_76426c93836a446db7be881da02757fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5ae9a90c8c14b5182aadd6f33253d2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_044e78700e9f47cb857e1dc0d1e58284.pdf
    • https://static.usrfiles.com/ugd/b8c837_13c88426f0d94e63b2eba14d524863fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7ceaabc4d1945d08c2a6225905d296a.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/art_of_problem_solving_introduction_to_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0464/6322/1912/files/cigna_annual_physical_exam_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52244446143.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/grief_and_loss_counselling.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_off00005da0.bin
4e4ab9b63989128b0e41b906206c7e64785b1caf3c17f1fbe2696896cd11e8b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA0 5252 bytes
font_01_sfnt_off00006f99.bin
2f9192446266d83d84ded7cbc34ff304d5d121bea684f96caf4439cb9e449252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F99 9996 bytes

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