Malicious PDF — malware analysis report

Static analysis result for SHA-256 321f9268b5808445…

MALICIOUS

PDF

48.8 KB Created: 2020-08-18 17:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fa4da57bab496be8f9c082e5b9cea0c SHA-1: 3d608aafad6b6f9b1694f3b32e8c9d697cdc0143 SHA-256: 321f9268b58084456919a7f609e7572f846eae34138fee2d707ad24039ccf227
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=balance+sheet+analysis+ratios+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. Additionally, a PDF link farm heuristic suggests the document is part of a larger SEO manipulation effort to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=balance+sheet+analysis+ratios+pdf
    • http://fapuxosiv.benny-oschmann.com/uploads/1/3/1/4/131407057/dizevu-lobede.pdf
    • http://files.mercedesugarte.com/uploads/1/3/0/7/130740184/2488704.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nexunalazuzifoginiwaboliz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/gomixapokuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2014/0191/files/verisign_timestamp_server.pdf
    • https://cdn.shopify.com/s/files/1/0453/9387/1016/files/bus_stop_method_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5846/1863/files/rejezajitokusedo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/86769447603.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sexewagufik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalajenoderemomepofelefa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2400/6823/files/53817824483.pdf
    • https://cdn.shopify.com/s/files/1/0435/7819/6129/files/93136208790.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/
    • https://cdn.shopify.com/s/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075b4.bin
0dc421831a3771d6b5f01ac054a2f04e295c2820c6cbb7bd60c5c9b7d7d480a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B4 5396 bytes
font_01_sfnt_off00008800.bin
114b81b4e8aef24a8d3210cceb6696c3500ab58070744ba09d38b4951274d93c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8800 14472 bytes

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