Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f175e5c94de37c…

MALICIOUS

PDF

38.8 KB Created: 2020-08-13 00:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0ffe684e316dde8bf48b737fe3f0ba0 SHA-1: e16e69265c732be4e22766ad5754228b9cafb813 SHA-256: b3f175e5c94de37c7606fdaf7a50d2c1800f84989f9fa12c394cdeed2ba46272
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to abuse SEO or link farms to distribute malicious content or phish users, with the primary malicious URL being ttraff.ru.

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/pify?keyword=introduction+to+seismic+inversion+methods+pdf
    • http://files.dinah-parums.com/uploads/1/3/2/6/132681517/mudufevemide.pdf
    • http://jidaku.elliotcoxracing.com/uploads/1/3/1/3/131398504/0e3586a7fb651.pdf
    • http://files.cresaptowneagles2883.com/uploads/1/3/1/4/131437380/renijoxinenivitevexi.pdf
    • http://files.syrianmigrationsolutionsproject.org/uploads/1/3/0/8/130813409/gawokawenep.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/motorguide_trolling_motor_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1385/7692/files/romojenivagafukurebal.pdf
    • https://cdn.shopify.com/s/files/1/0437/8260/2913/files/el_feudalismo_y_la_educacion_caballeresca.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/11036360218.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7428/files/40745032187.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/31072671266.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4025/files/40008907259.pdf
    • https://cdn.shopify.com/s/files/1/0438/1140/5986/files/56197993517.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/zogadebodenar.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/jelimutifezep.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_off00005991.bin
31135690a68909636e1d2c2257c79db248d2871bffc20efebbf87de0b59b61c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5991 5148 bytes
font_01_sfnt_off00006aef.bin
a7ee5897fd5049f4194b742ebe72fa0fcc1618eeaf0708a65383827c18169107
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEF 10212 bytes