Malicious PDF — malware analysis report

Static analysis result for SHA-256 e548d3e1b762c9fa…

MALICIOUS

PDF

45.6 KB Created: 2020-08-29 08:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8afdcb39fc55511302426360c31bbf5 SHA-1: a1d3b3d9d641c381d480cc39d5614e4e6b220710 SHA-256: e548d3e1b762c9fa94ee4e54b4d06b8b82020759900bf1a986a67faa9b8b7f89
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=anna+quindlen+a+quilt+of+a+country+claim'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious. The primary intent appears to be directing users to malicious infrastructure via the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=anna+quindlen+a+quilt+of+a+country+claim
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/muxabunawunixozizuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6194/3199/files/52074006913.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3062/files/kebokepanizofurug.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/joputokorufojuwam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67331216746.pdf
    • https://cdn.shopify.com/s/files/1/0435/4650/9461/files/osrs_cold_war.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1256/files/tomifuzixuliko.pdf
    • https://cdn.shopify.com/s/files/1/0440/0162/4214/files/intel_graphics_4400.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6e1513941d248f0b6715d196ef7923c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0112be33c4024272b3e7e00e42b4f45b.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf6d042501604a5ab710fa21e3333053.pdf
    • https://cdn.shopify.com/s/files/1/0438/8965/5960/files/is_cataract_surgery_performed_by_laser.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/44050522530.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2785/files/el_universo_neoliberal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/deweputililirope.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_off00007544.bin
7c680b74019df8d72294d4746ff8cd99199e2cd80b038aa81b1fca51b6077886
pdf-font-stream PDF embedded font (sfnt) at offset 0x7544 5204 bytes
font_01_sfnt_off000086e2.bin
004a9573fd3a9541106c3405e3a31bb83e2eaf40345ad55f3e79ded7397cc3d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x86E2 10404 bytes