Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b8bfab2d7fff43…

MALICIOUS

PDF

40.8 KB Created: 2020-08-13 23:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bd52781f39d40b13e2efd1dccaa8081 SHA-1: d16a457e1b6621fd45ea75dbb477966eb2eabd08 SHA-256: 35b8bfab2d7fff43f1d15afd16be9dc679b9d718402c72e7a2d90de6933e45ba
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to other PDF documents hosted on Shopify. One of the primary links, https://ttraff.ru/wb?keyword=briket%20sabut%20kelapa%20pdf, is identified as a malicious redirector. This suggests the document is part of a link farm designed to lure users to malicious infrastructure. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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/wb?keyword=briket%20sabut%20kelapa%20pdf
    • http://files.elvirabasevich.com/uploads/1/3/2/6/132695865/votaxuxarox.pdf
    • http://duzab.brtrescue.org/uploads/1/3/1/6/131606345/xuwenafelome.pdf
    • http://files.tracykeencreative.com/uploads/1/3/1/6/131606027/nuzisunolaweba-wamotugabezirit-bidiwopazukefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0512/files/vtech_dect_6._0_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/8178/4734/files/dvt_treatment_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/xisak.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2454/files/dawapinaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/1188/2655/files/tenulibagekaxodibuwofewo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/91568502089.pdf
    • https://cdn.shopify.com/s/files/1/0449/7424/3999/files/o_que__matriz_swot.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/14090450106.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/vibugivu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7677/9174/files/99931120677.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2404/files/putosusazunuzigerog.pdf
    • https://cdn.shopify.com/s/files/1/0450/3647/0430/files/physical_science_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/7528/8732/files/bihar_stet_2020_computer_science_question_paper.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_off000060ad.bin
8b709bc6771d7c59d6b0c2ef3b485b90ebcab47d9d62cfed7e38a070ac7426ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AD 5288 bytes
font_01_sfnt_off000072b7.bin
9f5e2c60b83aea7b8ad053e8fecc2873ff56e31560d71c5a4f06df494318ee63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B7 10568 bytes

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