Malicious PDF — malware analysis report

Static analysis result for SHA-256 473cfedd35794bec…

MALICIOUS

PDF

49.4 KB Created: 2020-08-04 20:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5e1d7d84d6f547cafa192a3a9934e20 SHA-1: be77009c0b738022482daee28d33c82601a064ac SHA-256: 473cfedd35794bec6f7c64be1fd7d3c4fae4c82d139a0885134940dcdcc90f94
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the text 'double word analogy test with answers pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. 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.ru/pify?keyword=double+word+analogy+test+with+answers+pdf
    • http://files.spiritualfringe.com/uploads/1/3/1/4/131453530/02b40afb7.pdf
    • http://files.drdom.com.au/uploads/1/3/0/9/130969761/4f6d1fb7.pdf
    • http://files.americaimproving.com/uploads/1/3/0/8/130814057/1678866.pdf
    • http://files.santasacksbyreno.com/uploads/1/3/2/8/132815050/04c2e4fbba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9418/7933/files/keregiwabevomila.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/vulture_city_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/6660167998.pdf
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/jipileperaneboga.pdf
    • https://cdn.shopify.com/s/files/1/0437/5661/7877/files/sapakaniweken.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/libros_de_jorge_baradit_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/ielts_speaking_topic_vocabulary_20_topics.pdf
    • https://cdn.shopify.com/s/files/1/0436/6876/6873/files/lizunotugukiragivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95909873105.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/fexelelubamabera.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4673/files/1742190829.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_off000080fd.bin
1cc06ad061cec4d333101793b1676efb42d4265514b0eee7f29c06e7244bc625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FD 5636 bytes
font_01_sfnt_off00009435.bin
94e4eba2cdedb9aca7e48ec4f2a6bb07e928e756fc2e7e656e2c72543840f337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9435 10040 bytes

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