Malicious PDF — malware analysis report

Static analysis result for SHA-256 96cc88231d341810…

MALICIOUS

PDF

41.1 KB Created: 2020-08-19 20:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9e259fb8d6a4aa1589aedb2ac3fb1d7 SHA-1: c022c15327d985b82c9e567f3472ae6182a60c1b SHA-256: 96cc88231d3418105b4f9e8d011b5b5f8cf6ffd10ec39f3ac63ecf94d8884d4f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to 'ttraff.cc', a known malicious redirector. The document also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/pify?keyword=new+version+of+chrome+free
    • http://files.naturalhealthprotocol.com/uploads/1/3/1/4/131438142/9265671.pdf
    • http://files.ahnorthodontics.com/uploads/1/3/1/3/131383657/1631433.pdf
    • http://files.chant-elle.com/uploads/1/3/1/4/131453251/cadb0.pdf
    • http://files.tendcraftco.com/uploads/1/3/1/4/131437307/janamagefubito.pdf
    • http://tukonokiw.villagesbmwzclub.com/uploads/1/3/0/9/130969723/bigisilumivopobo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5458/files/sidomanaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1586/files/mathematical_economics_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2119/files/47760969045.pdf
    • https://cdn.shopify.com/s/files/1/0436/8610/1145/files/el_acto_administrativo_peru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fawalonilon.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/wonozitetalilesupaminez.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/muzizijenerurokeril.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_off000063f5.bin
8438f938ac6959a1f6225ad25f3da53d8283b23c3d917cea88bb8608b181b030		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F5 5000 bytes
font_01_sfnt_off000074ec.bin
b0c9483f1fa240ad0c3d0c9db10063500ad158467624978ed6a7cc54c93e7ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EC 10252 bytes

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