Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b815cb1613d399…

MALICIOUS

PDF

43.5 KB Created: 2020-09-01 22:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53e43a79055a164e6094123d6029f971 SHA-1: 564f2a8b10e7f99ad126ec263a6f67e61b02fca2 SHA-256: 58b815cb1613d39977a8881bff48a32d7d5c844ee8da1a3a649bcc47f7abd12e
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=costochondritis+patient+information+sheet'. This link is presented within the document body, disguised as a patient information sheet. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify domains. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

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.link/wix?keyword=costochondritis+patient+information+sheet
    • https://static.usrfiles.com/ugd/fd7405_3745891a196e4733b2a3e2a53975ffd8.pdf
    • https://static.usrfiles.com/ugd/cc03df_f62f8feb532b4340bba87bc4275c5e7f.pdf
    • https://static.usrfiles.com/ugd/de3d83_2534742c07304a319ac678b67d6ecb69.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/dobotelafip.pdf
    • https://cdn.shopify.com/s/files/1/0434/2428/4824/files/rental_agreement_format_in_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5879/7471/files/basabavesivara.pdf
    • https://cdn.shopify.com/s/files/1/0438/3847/2357/files/blue_prism_training.pdf
    • https://static.usrfiles.com/ugd/58a813_ea97891bdd3b42cb8766b92f6824f10c.pdf
    • https://static.usrfiles.com/ugd/9cb927_9d501081272e404bbf6d82586eae6c5c.pdf
    • https://cdn.shopify.com/s/files/1/0432/1286/5693/files/90200044697.pdf
    • https://cdn.shopify.com/s/files/1/0437/3898/8709/files/php_for_dummy.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/65492748802.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/risk_assessment_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/9662/8641/files/learning_basic_korean_language.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f8f.bin
7cb14e45c49519afa5d4c3476d68a4ecd89a7d895e68022a3cf6ab7db479eb1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8F 5172 bytes
font_01_sfnt_off000070f0.bin
bb55273292881bfb0c5c6cd03e2fe67da99ae28a17f85efe50ccc349c42db3e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F0 9972 bytes
font_02_sfnt_off00009312.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9312 4324 bytes

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