Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca72f64965ce0f1c…

MALICIOUS

PDF

40.8 KB Created: 2020-09-09 10:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ec45cca41d0c63f31b6b7b35729d18a SHA-1: c91ac00224e8c9efde276038e2ab0bb0c3565fa8 SHA-256: ca72f64965ce0f1c43620ccfb50117694cf22899aa90910e2b18e5840e24199f
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: 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 specific URL, https://ttraff.club/wix?keyword=briony+fer+on+abstract+art+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this malicious URL and references to other PDF files, suggesting a social engineering attempt to drive traffic to malicious infrastructure.

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.club/wix?keyword=briony+fer+on+abstract+art+pdf
    • https://static.usrfiles.com/ugd/405339_e3eb01f6b56f41d784d78c701ce62279.pdf
    • https://static.usrfiles.com/ugd/c345b0_99bee6063b9546bc8b11d723b90d04b0.pdf
    • https://static.usrfiles.com/ugd/f99735_e5706adf859045dc841ce12eae9eb7a6.pdf
    • https://static.usrfiles.com/ugd/2072cd_f129c980c0f747a0a1999cf05e303128.pdf
    • https://static.usrfiles.com/ugd/cf79db_3f3795365d414dbf8227bc016542316b.pdf
    • https://static.usrfiles.com/ugd/ea2c45_f3b715069adb4f90beac38faecf95f96.pdf
    • https://static.usrfiles.com/ugd/cb4a18_72c2af19cc8941dab5405427de229b4f.pdf
    • https://static.usrfiles.com/ugd/1e557c_1293be2bc0a84886858a2cdf70105ff2.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/vomorodalofan.pdf
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/wovelozopufefar.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/46977343240.pdf
    • https://cdn.shopify.com/s/files/1/0436/5742/9145/files/dalolaloxala.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/9005105420.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5580/files/14885863217.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/giguzo.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_off00005f6e.bin
6b2a45e498ffb4da2182eee834e3241304d19993327ed6f4174725b32ef0968a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6E 5408 bytes
font_01_sfnt_off000071e7.bin
0b531f09b878f50e6e6afd7064e1624f22982e3586d40e9e64491123edbf76f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E7 11084 bytes

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