Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f2fc07870e47ed…

MALICIOUS

PDF

33.2 KB Created: 2020-08-18 16:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec748e51021ee1ad5c67877ac3dc93b4 SHA-1: 9e7f6e2bef32687df9d9b35ff6d56784f98580d9 SHA-256: d5f2fc07870e47ed6affff8b22b736a14d45bfdb37a3929a6a6bc414274c56f7
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious content. Additionally, the PDF hosts a large number of external links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=lagu+lily+dj+soda
    • http://files.knysnahope.org/uploads/1/3/1/4/131437484/xebefiwogix.pdf
    • http://files.delphiniumservices.com/uploads/1/3/2/8/132815787/6995361.pdf
    • http://bibigibu.greaterpittsburghmontessorisociety.org/uploads/1/3/2/6/132682076/disibax.pdf
    • http://files.thrivingage.com/uploads/1/3/2/6/132681954/matuviwotutev.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/5883064319.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/83960149374.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/45587008475.pdf
    • https://cdn.shopify.com/s/files/1/0435/1387/2548/files/80147828940.pdf
    • https://cdn.shopify.com/s/files/1/0431/8537/3333/files/punctuation_worksheets_for_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/53603291827.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/mozam.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/viliwurize.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/90319803129.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/rabemidajofepi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/66988898950.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_off000045cf.bin
6f885b2be6e90bbbf6bcc708bf0dcd9e9c2356a94f2c489dda58f8bb90fc2865
pdf-font-stream PDF embedded font (sfnt) at offset 0x45CF 5016 bytes
font_01_sfnt_off00005704.bin
72b56daa24722094a053a5ae120c38557c27d73ece169ea37bcc5f1a7ed03e98
pdf-font-stream PDF embedded font (sfnt) at offset 0x5704 9752 bytes