Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97943300addd3dc…

MALICIOUS

PDF

40.7 KB Created: 2020-08-23 01:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1124df7a8e9f296f407cdde7b17cd15 SHA-1: 5fe1a4a40340a688529d3f9623f6ec2b2aa09ded SHA-256: c97943300addd3dc418a6ecad473e273cb9f95ef600fbbbfa431e3cac846e913
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is used in conjunction with a link farm technique, embedding numerous links to external PDFs, many hosted on Shopify. The primary malicious URL is used as a lure, disguised as a 'family tree english worksheet'. The ML classifier also strongly indicated maliciousness.

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=family+tree+english+worksheet
    • http://files.irwinquagmirewart.com/uploads/1/3/1/4/131409037/zoxomudi.pdf
    • http://files.kinoschool.org/uploads/1/3/1/3/131398573/dodogumig.pdf
    • http://vugolu.tactdrama.com/uploads/1/3/1/4/131453870/9088963.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/wanejiratedususesojoletu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8501/9801/files/xafubuvetu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/materi_filsafat_pendidikan_islam.pdf
    • https://cdn.shopify.com/s/files/1/0431/3645/0717/files/bowflex_hvt_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/zapiburavanarugo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3277/1750/files/15804731439.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0899/files/nimikawiwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0655/6320/files/lobikene.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_off00005ab0.bin
184fe567c401293148cdd4070b40becbc3c5ac124553f88a7ab8132ca54134ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB0 5312 bytes
font_01_sfnt_off00006cb2.bin
604a72b8e13ccf6bcc981928b1c08756d03756f122b92fb79b4de01ef6d02529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB2 13152 bytes

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