Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb0baefd1b11010…

MALICIOUS

PDF

48.5 KB Created: 2020-08-19 09:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0f46a14b897eca10aa79f16fc1f938e SHA-1: 576a8f609897430b6bee7a85c0cfdc40600cbf2d SHA-256: cbb0baefd1b11010883519c6a7e6be98c68770f977f20a8e72babefca253c028
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or redirector tactic to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the payload.

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=how+to+configure+extent+reports+in+jenkins
    • http://files.wefixcreditright.com/uploads/1/3/0/7/130739517/tiwovamav_dupogepubunanud.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/as_10_revised_icai.pdf
    • https://cdn.shopify.com/s/files/1/0428/6119/9526/files/fluke_87_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/mujiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/building_construction_company_profile_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0440/7456/5784/files/wiviwadezezij.pdf
    • https://cdn.shopify.com/s/files/1/0438/6865/1680/files/1911756107.pdf
    • https://cdn.shopify.com/s/files/1/0433/5219/5230/files/2239693916.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/66782096416.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/bop_it_xt_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/quiz_games_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/16876382267.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0804/files/bodabudadog.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_off000071ce.bin
bbc84795a38fc7cb1545b7a2e6b4b603c26ea0d9e8cde10b3e42c17536376890
pdf-font-stream PDF embedded font (sfnt) at offset 0x71CE 5204 bytes
font_01_sfnt_off000083b1.bin
464091408adf229fdac22b7d4315b8c804b54574c05082686ba264b6c5c0c419
pdf-font-stream PDF embedded font (sfnt) at offset 0x83B1 15708 bytes