Malicious PDF — malware analysis report

Static analysis result for SHA-256 227b373192d8ae56…

MALICIOUS

PDF

54.3 KB Created: 2020-08-22 03:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b62d944cc2cbd1bacae681c27b7c0434 SHA-1: 68bd04921871c98325edc21f1618fd75409e7970 SHA-256: 227b373192d8ae56563087a2f9ca8130af33f6ace5d803c8d8049262bf04a8a8
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm designed to generate traffic, and the ML classifier strongly suggests malicious intent. The primary attack pattern involves luring users through these links, likely to a phishing or malware distribution site.

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=cardiff+central+station+platform+layout
    • http://watutadaf.positiveposturenz.com/uploads/1/3/2/8/132816066/4087852.pdf
    • http://files.misschristinaclassroom.com/uploads/1/3/1/3/131379948/ef650cc2d6.pdf
    • http://files.eyexlife.com/uploads/1/3/1/3/131398235/5739642.pdf
    • https://cdn.shopify.com/s/files/1/0432/0745/8975/files/wajigizov.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/66664379105.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0797/files/mixuwibeji.pdf
    • https://cdn.shopify.com/s/files/1/0438/4981/0080/files/cheddars_restaurant_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0438/1795/9586/files/rudram_telugu_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/79819620572.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/34822660745.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9587/files/lejeb.pdf
    • https://cdn.shopify.com/s/files/1/0448/9697/7051/files/97469980164.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/41277064553.pdf
    • https://cdn.shopify.com/s/files/1/0444/4468/0359/files/extended_euclidean_algorithm_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0133/files/wetokarixosojagorido.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/pdf_math_minutes_5th_grade.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_off00009809.bin
29a4a8b8966bff35cc57e0b5b0d60ddb8f93c1d8df78529b181f8863dfdbbe4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9809 5308 bytes
font_01_sfnt_off0000aa09.bin
6adbb7ec477a58ba3306e7342ebf90ea6f5f467e282a2e8271df018ee30b1dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA09 9980 bytes

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