Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5726a669910ce8…

MALICIOUS

PDF

59.4 KB Created: 2020-09-02 19:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d2004dfcd44aed968a5986dece4a6f8 SHA-1: 6944e10bf8171415bf7120d5b174ff47d48add8c SHA-256: ba5726a669910ce8f9f4cc0a7df58efc718b60015de7d5df188f2c21f9aebe7d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches this finding. Additionally, a PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, with the primary one being to a Shopify domain. The ML classifier also flagged this PDF with high confidence. The primary malicious IOC is the redirector URL.

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.club/wix?keyword=pirates+of+caribbean+song
    • https://cdn.shopify.com/s/files/1/0436/4589/4816/files/autocad_interior_design_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/magazine_rack_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/egyptian_cotton_bath_sheet_sale.pdf
    • https://cdn.shopify.com/s/files/1/0466/6553/1557/files/questes_sobre_administrao_pblica.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6048/files/work_rules_laszlo_bock_free.pdf
    • https://static.usrfiles.com/ugd/271e65_6020c07ad2ea422c80edd836bb86e292.pdf
    • https://static.usrfiles.com/ugd/4826f5_4adf35b0d7de4b1fb5c54ddb34415ed4.pdf
    • https://static.usrfiles.com/ugd/868401_dfb6368666a74c31a8f3600c9a28a610.pdf
    • https://static.usrfiles.com/ugd/de60da_c21c9f5f9550488381bec9b18f01b6c9.pdf
    • https://static.usrfiles.com/ugd/f967ac_77c7a9dcd7034f8186710f5a05bfcc18.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008370.bin
5ff7ff9bdf208325effcd5c88d3c5a5db34d605afb269dd6eed27c804f7530ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8370 4944 bytes
font_01_sfnt_off00009446.bin
190a37db06627c0c9f8ae7b29abec35c7630d2877703b25dee9c612468ea282b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9446 11356 bytes
font_02_sfnt_off0000b9d6.bin
e6a640229af0e0879ecb10921706a824cccef6c898c2e8a67f62d8e05424d761		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D6 17196 bytes
font_03_sfnt_off0000d2af.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 4324 bytes

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