Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3f4ae11f6b3533…

MALICIOUS

PDF

57.8 KB Created: 2020-08-22 09:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b68dd037e60184e9e41ce8a2cdc5c8ce SHA-1: aaae884d5a20ff038fe47d97c3bc4276ea2140a1 SHA-256: 3b3f4ae11f6b3533806592bdac09ad30100ab87d09f5e2a96c386a058a6a1363
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=python+numpy+array+affine+transformation', suggesting a lure to a malicious site. The presence of numerous Shopify-hosted PDF links indicates a link farm designed to manipulate search engine results, likely as a precursor to delivering malware or phishing content.

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.com/pify?keyword=python+numpy+array+affine+transformation
    • http://kafexero.azeetanielsen.co.uk/uploads/1/3/1/3/131398539/kivokojudi_misojegobisa_muzeraseg.pdf
    • http://files.lindyjames-christenson.com/uploads/1/3/1/3/131379612/3953267.pdf
    • http://taras.wctherapygroup.com/uploads/1/3/2/6/132696056/tijozotolamawot-raniveruv-rupefewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1192/files/lapepufil.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/88319520116.pdf
    • https://cdn.shopify.com/s/files/1/0436/9829/0856/files/ruxudaraduwetofaketomamen.pdf
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/nunej.pdf
    • https://cdn.shopify.com/s/files/1/0428/2908/6876/files/score_hero_hack_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/0905/6668/files/zagexavop.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/88286527190.pdf
    • https://cdn.shopify.com/s/files/1/0431/2865/1938/files/16431048607.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/95130332369.pdf
    • https://cdn.shopify.com/s/files/1/0465/4222/5566/files/ieee_report_format_latex.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_off00009d03.bin
d95ff8b4abfbc7d853b499ebfbcf71b9f91b270d5cda04cd62477e3e9d2e2bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D03 5212 bytes
font_01_sfnt_off0000ae93.bin
2739ed633a07addcf85cf04bd59b924ed580528ca321f771574fa5d0266ed2d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE93 14132 bytes

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