Malicious PDF — malware analysis report

Static analysis result for SHA-256 42320a7564722028…

MALICIOUS

PDF

50.1 KB Created: 2020-08-29 14:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb4d9ac4d6a539338833b243239a44cd SHA-1: bb645f5b9e9e8f3eef23d1530b7d9c073104d8de SHA-256: 42320a7564722028f63d6aaeb179d9bee45d10af6f416199e587ca59d71d48e0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is embedded within the document body, disguised as a search result for a refrigerator model. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to benign Shopify-hosted PDFs. The primary malicious intent appears to be redirecting the user to the 'ttraff.ru' domain.

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=samsung+rf28hdedpww+refrigerator
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/23331075814.pdf
    • https://cdn.shopify.com/s/files/1/0431/5512/8480/files/76325154553.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/zesebupeme.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c007da6a7b64c88bcc7eec1e8e10446.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7da75ba80ab43c5813794c0313eefb6.pdf
    • https://cdn.shopify.com/s/files/1/0433/7762/3194/files/vicks_vaporizer_v3100_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/dukorilibo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/dowulabawimifonom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jikoleluvotejagumali.pdf
    • https://cdn.shopify.com/s/files/1/0433/9702/1854/files/mentorship_request_email_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1926/files/bachon_k_islami_naam_uska_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0462/3902/3253/files/bekuvuvadegipizasilameges.pdf
    • https://cdn.shopify.com/s/files/1/0434/6645/7254/files/75208190260.pdf
    • https://cdn.shopify.com/s/files/1/0434/1959/9004/files/1806734056.pdf
    • https://cdn.shopify.com/s/files/1/0439/5496/2590/files/administrador_de_dispositivo_android_apagado.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_off00007699.bin
314fa74f52e7964bf39de0d74948c9946f134efa73eea0dfa3aa7c5c3144db7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7699 5944 bytes
font_01_sfnt_off00008ab4.bin
3b44df3c16cd700695afd48a079761e9754328af96f5a0786dea32f5c17a785e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB4 15004 bytes