Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f6e4ce817e0eb0…

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 14:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 970be61da4c8327b157535d15c5b38df SHA-1: 25358753324c934ecc677d11b128f2ef8f7a3243 SHA-256: d5f6e4ce817e0eb00d61b564b549b84aa6f2f78b46ac9d24f1bddf2ce2afe306
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file exhibits malicious behavior through a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic reveals a large number of external links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. The presence of a SE_LOLBIN_RUN_COMMAND heuristic suggests that the document may also contain instructions for executing commands via Windows scripting tools. The primary IOC is the redirector URL, which is likely the entry point for further malicious activity.

Heuristics 4

  • 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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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/pify?keyword=forms+of+vitamin+k
    • https://static.usrfiles.com/ugd/d43733_e9fe214e6c7346a7b1c7000df61700c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5af70aa5c86a47dd94597060da276b02.pdf
    • https://static.usrfiles.com/ugd/b8c837_41a4300a82a9462787159e78bc8f7f84.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/calendar_october_2019_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1042/files/35330065488.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/94284061879.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/xexotitunufidejanawa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8014/5313/files/autoformation_excel_2010.pdf
    • https://static.usrfiles.com/ugd/ce14f3_71a7adfb38c342dfba07c4188577dfea.pdf
    • https://static.usrfiles.com/ugd/b8c837_83e7b438a15d4094861e66aa57458834.pdf
    • https://static.usrfiles.com/ugd/b8c837_6600a5087b08426593fa40eed2ac5b6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_759aa6e64ffc4c9f9be74f5447643399.pdf
    • https://cdn.shopify.com/s/files/1/0434/2294/1351/files/dazuzofabaxixa.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7248/files/php_curl_post.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/tesutudovaluximolumovikux.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/purupemijafonofawifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4981/files/71115187353.pdf
    • https://medlineplus.gov/vitamink.html
    • 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_off00006e90.bin
cb8394212680598268294de02c87918d08f451cf684075dc11ec87992c69c4d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E90 4960 bytes
font_01_sfnt_off00007f60.bin
b5f27182755b8644c959d47e2ba3239ac8b70702f88422b8258e8b7a52646ea6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F60 10304 bytes