Malicious PDF — malware analysis report

Static analysis result for SHA-256 c059c291dc0ee97a…

MALICIOUS

PDF

37.7 KB Created: 2020-08-30 02:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a4a0e2740ef5c3c92e410a96559a49a SHA-1: 08b51ddf8377db3f9fb01c39e04f98af439204d3 SHA-256: c059c291dc0ee97a14eaa220b34b2bc9d04446ebbca7f9a1311bf821e0ccf946
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, constituting a link farm. One of these links, https://ttraff.com/wix?keyword=matematicas+3+zill+pdf, is identified as a malicious redirector. The document body itself contains garbled text but includes the same malicious URL, suggesting it is the primary lure. The presence of numerous external PDF links, many hosted on Shopify, indicates an attempt to manipulate search engine results or distribute content through a seemingly benign platform, while ultimately directing users to malicious sites.

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.com/wix?keyword=matematicas+3+zill+pdf
    • https://cdn.shopify.com/s/files/1/0428/6654/0711/files/94154447949.pdf
    • https://cdn.shopify.com/s/files/1/0439/1128/2843/files/bioplastic_starch.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/ductwork_fabrication.pdf
    • https://static.usrfiles.com/ugd/b8c837_a357a50928244d5bb6def5c10414f7e1.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1063/files/centerpoint_rimfire_3-9x32_mil-dot.pdf
    • https://cdn.shopify.com/s/files/1/0434/1704/3101/files/boyce_and_diprima_10th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/hesi_pharmacology_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/2952/7709/files/malaguena_tab.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4457/files/ravewedobovegagakenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/60688045384.pdf
    • https://cdn.shopify.com/s/files/1/0438/0963/6512/files/dibujarte_s3.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_off00005664.bin
54b6ab9c44407124c62c5406d19c956c38ebec85e1f07c5481e3e2776b012232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5664 5424 bytes
font_01_sfnt_off000068d4.bin
6024bc95f38ffbd7cdb887dc05cf4f040bdb8c325db30d4745c1d1a858cde8ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D4 9964 bytes

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