Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee157c27b39ab123…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 23:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd1e98fee665eb0ea29b9d891622ef40 SHA-1: ddfd6b65d27c35a3328dc2125d209a04e4b69bb0 SHA-256: ee157c27b39ab123f8fe9bff9fe353891d6079941ba758375b2c9c2c2f971731
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: 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 the primary links directs the user to a known malicious redirector at ttraff.ru. This indicates a social engineering attempt to direct 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=avery+l7163+label+template
    • https://static.usrfiles.com/ugd/a4e402_67b803093b12466eaee2f3e09d520607.pdf
    • https://static.usrfiles.com/ugd/f46427_bc863aff415c4ef2950c18d805f68318.pdf
    • https://static.usrfiles.com/ugd/b8c837_922d640a9751425b9e720093c48995a0.pdf
    • https://static.usrfiles.com/ugd/158fb9_f8d3c53886ed499eb5eabc8222c0b9b6.pdf
    • https://static.usrfiles.com/ugd/be19e1_64a929f23af4471ca485b92848dd61a0.pdf
    • https://static.usrfiles.com/ugd/d162e3_70298bb2bb79485fb9cbdf842e87b828.pdf
    • https://static.usrfiles.com/ugd/3aca14_90fabbea9b7e4026a049abaea23c21db.pdf
    • https://static.usrfiles.com/ugd/b8c837_37475495a1fd49119f4afbe7eedaad49.pdf
    • https://static.usrfiles.com/ugd/fd30ac_1f103764118e47a39189c7ab9b6b9871.pdf
    • https://static.usrfiles.com/ugd/8b2c09_94ed3135d07d46cf9e912e4df99e7b2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_508cda4d23d54856917eb2fdf5afd3ef.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/63951115637.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/binomial_and_cdf_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/zetegigamaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0744/2072/files/41483000117.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_off0000566a.bin
5d4807fbb7d1994e476f8445e6291b38b775656122394c591f46374f198a871a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x566A 5528 bytes
font_01_sfnt_off00006936.bin
8689a9d57de3fb8332e93ee125bfc0fa1273f87de796f1ec3114190c865c23f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6936 14056 bytes

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