Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd825e4dbe56704…

MALICIOUS

PDF

39.4 KB Created: 2020-08-06 12:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c723d475438cfad1b816da9082fdfb8 SHA-1: e026fb4222b6a314e648bdbb1835cd19a83773ad SHA-256: 7cd825e4dbe56704408fe1ccf359382a3d12fde499b39d6cc59ea857e68d7dca
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files, which is indicative of a link farm. One of the primary links, https://ttraff.ru/pify?keyword=homes+around+the+world+oxford+pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, though heavily corrupted, contains fragments of the URL and keywords suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=homes+around+the+world+oxford+pdf
    • http://files.rifthppd.org/uploads/1/3/0/8/130873855/781a476cba.pdf
    • http://files.saintisidoresalpacas.com/uploads/1/3/1/3/131379306/2854da395b2f91.pdf
    • http://files.katiesgarden.co.uk/uploads/1/3/2/6/132682210/xesagaxivopibumoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/28281800733.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/milokelegesiwukajaluvupu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0203/4336/files/7478484809.pdf
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/61877546316.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/raripilabaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4192/2977/files/28078811491.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/88789984905.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/6052497836.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/gekitab.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/54692915015.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_off00005c84.bin
38920257fa398add3b00e8632162220e472eaace5b06b7a395b5c71f2304cf97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C84 5400 bytes
font_01_sfnt_off00006ec9.bin
da9e5a3163653679b40b562a04d43b1f35cbe915dbe0d49c85153e1ce7ec2ae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC9 10020 bytes

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