Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2196a08dc2842e…

MALICIOUS

PDF

35.9 KB Created: 2020-08-19 03:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e431e33eae611e38fd5ed7dd79b28e15 SHA-1: ac34253fba4d5f6b2d02de14b9842c45626d73a9 SHA-256: 3b2196a08dc2842ebcc211a9abeab5352aedff3aa7163e2e8901f2ad77a9ade8
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 pointing to various PDF documents, many hosted on Shopify. This pattern is indicative of a link farm, potentially for SEO manipulation or to distribute further malicious content. Crucially, one of the embedded links, 'https://ttraff.ru/pify?keyword=bhojpuri+video+film', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=bhojpuri+video+film
    • http://files.mariescott.net/uploads/1/3/0/7/130738637/7299360.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/boolean_algebra_mcq_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/1852/5599/files/mla_format_website_citation_multiple_authors.pdf
    • https://cdn.shopify.com/s/files/1/0434/2012/3285/files/bamufunatuxena.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/jinedafo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8150/4670/files/ece_interview_questions_and_answers_for_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/87233754860.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/80866811411.pdf
    • https://cdn.shopify.com/s/files/1/0432/2682/4863/files/67887789394.pdf
    • https://cdn.shopify.com/s/files/1/0433/6333/6350/files/razenusuvo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0639/files/gapebenakekajobadun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9697/files/15548657671.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nowivozepax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043fd.bin
fb1f94d1c46721ecf18cea10418cbb62d5da5fa947912b2a54f95963734d4782
pdf-font-stream PDF embedded font (sfnt) at offset 0x43FD 4776 bytes
font_01_sfnt_off00005442.bin
a5d07a32bae8f64c2e74a8237b0ab79b32b95854e05ccf23c3a9832f4eafa4ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x5442 9568 bytes
font_02_sfnt_off00007509.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7509 4324 bytes