Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08a7bd9147cddbc…

MALICIOUS

PDF

53.8 KB Created: 2020-08-31 00:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0c2e6d6c01a40332f37410248f3857e SHA-1: 7bfdb5bd929b25eb98726f8da712883fa834dcaf SHA-256: a08a7bd9147cddbcb9aa18489a2a583b9cbc7f4fac85d80d42eb974034a2c06b
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 external links, with one heuristic specifically identifying it as a PDF link farm. One of these links, 'https://ttraff.cc/wix?keyword=dnd+5e+creature+sizes', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO manipulation or directing users to malicious content through a large number of links.

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/wix?keyword=dnd+5e+creature+sizes
    • https://cdn.shopify.com/s/files/1/0434/0937/5383/files/72781739766.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5430/files/29602082919.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/31009923585.pdf
    • https://cdn.shopify.com/s/files/1/0437/2594/7029/files/majujekakorimonigunuru.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/19984203469.pdf
    • https://cdn.shopify.com/s/files/1/0431/5758/6071/files/godobodi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1921/3727/files/telescopic_banner_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/7988/3170/files/divifolesopag.pdf
    • https://cdn.shopify.com/s/files/1/0437/1863/9765/files/cognitive_thinking_skills_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/dugitofizugo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/dawevebivagasijuxiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/medigubog.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/past_tense_present_tense_future_tense_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/tesla_stock_market_information.pdf
    • https://cdn.shopify.com/s/files/1/0428/7673/1558/files/cash_flow_diagram_template_excel.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/introduction_to_human_physiology_book.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_off00009503.bin
81ca3a7f435638498e32fd3cdeed16ee6a219a650625c7e757db19637e781995
pdf-font-stream PDF embedded font (sfnt) at offset 0x9503 5072 bytes
font_01_sfnt_off0000a652.bin
eebe2532d204c0102906fc5161adac7ac82dd4788b465594e80f45dc8f316778
pdf-font-stream PDF embedded font (sfnt) at offset 0xA652 10576 bytes