Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1661b201af8f1d0…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 09:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a05eb046107b05842528ccd32917e73f SHA-1: 0ad1f6dbceb5408e9af4695b9c4539fef0475328 SHA-256: c1661b201af8f1d00ead4ec98783d3da9cace199541f01271ecf8d333088e82e
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, forming a link farm, with the primary purpose of directing users to potentially malicious content. One of the embedded URLs, 'https://ttraff.me/wix?keyword=las+pruebas+del+atletismo', is flagged as a known malicious redirector. The document body itself is largely unreadable due to encoding issues but contains the text 'Las pruebas del atletismo', which corresponds to the malicious URL's keyword parameter.

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.me/wix?keyword=las+pruebas+del+atletismo
    • https://cdn.shopify.com/s/files/1/0431/4900/0864/files/vuvodujiwofekixarade.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/elite_dangerous_ship_progression_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/roxopipowapofunun.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/51833794470.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8915/files/comprehension_questions_and_answers_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/3464/7460/files/17955333412.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/nesiwovakibole.pdf
    • https://cdn.shopify.com/s/files/1/0428/4301/3287/files/vozasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/transport_canada_flight_instructor_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6911/2474/files/statistical_data_analysis_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0438/1969/6290/files/difference_between_automobile_and_automotive.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_off0000642f.bin
a650769113aaf5f2be3cd18124f35716b4791c8b2658e31f73696a0063fbd856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642F 5188 bytes
font_01_sfnt_off000075b4.bin
e9bd6c368ac86d94a8103052a1e93627ad05a7fa19e168000a3b6b8db15fdbc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B4 10560 bytes

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