Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc53d494f826594…

MALICIOUS

PDF

41.0 KB Created: 2020-08-04 12:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53945caf7162a7c9bb915bee8f61579e SHA-1: 7cda1b23fe8acd3c390837230caec1340d219bca SHA-256: 4cc53d494f826594d5801f083b90f0044215ab0d879ec7fe79b0b13b4a9dfb25
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One of the primary links, 'https://ttraff.ru/pify?keyword=math+sequences+worksheet+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking URLs hosted on Shopify, suggesting a lure to a malicious site under the guise of educational content.

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/pify?keyword=math+sequences+worksheet+pdf
    • http://files.kevintdcobbs.com/uploads/1/3/0/7/130739789/desuvuvosudamebufab.pdf
    • http://files.serenitycottagelondonontariocanada.com/uploads/1/3/0/8/130813992/0ff871b786918.pdf
    • http://files.diningsolutionswickerpark.com/uploads/1/3/1/1/131164159/wegunanaberago_sevudogi_sodunivogumuzif.pdf
    • http://files.blankpagesworkshops.com/uploads/1/3/0/9/130968996/6c1f7be0cfe6a.pdf
    • https://cdn.shopify.com/s/files/1/0439/3621/9291/files/43690021167.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/risekumomivedopela.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/34479901002.pdf
    • https://cdn.shopify.com/s/files/1/0433/4334/7877/files/xexej.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/firorake.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/sogavodab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9772/files/glass_no_kamen.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/46358086254.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0501/files/77803124775.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_off000061ac.bin
b371c2beea073dfa77283cec5c108e9be78619c21caae5d805537a8399a20e19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AC 5496 bytes
font_01_sfnt_off00007475.bin
6d830b22799df76a84ded9fdb34c7d3a3db841baa46ed5616a4afd74fdbaf0ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7475 10180 bytes

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