Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29f62c8c9551db6…

MALICIOUS

PDF

59.0 KB Created: 2020-07-31 14:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 056690952a5d9d974c12e580b41d5f99 SHA-1: bcf8775c277a41c240ff0a92f83744da10e14438 SHA-256: b29f62c8c9551db6c8941a5c0e70a47b69eeaf2fb2403aade3638b7b6b325cf5
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'math algebra rules pdf' and mentions 'wkhtmltopdf', suggesting a lure to download a seemingly legitimate PDF. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to malicious infrastructure.

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=math+algebra+rules+pdf
    • http://files.kachinacountryusa.com/uploads/1/3/1/4/131438397/9475990.pdf
    • http://files.redplaitinterpretation.com/uploads/1/3/1/8/131856852/102234.pdf
    • http://files.bleuprinthairstudio.com/uploads/1/3/0/7/130775392/5106866.pdf
    • http://files.ahmedrefaey.com/uploads/1/3/1/8/131856186/rokifif.pdf
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/bedavemu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/dikaximurejiwajovepob.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/17737243916.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/valefe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/45673760611.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5129/files/roperatuvakakozixuri.pdf
    • https://cdn.shopify.com/s/files/1/0440/6630/8246/files/kileremoganobukokikef.pdf
    • https://cdn.shopify.com/s/files/1/0430/1484/8671/files/goluvutogisimajamaginuput.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/fixatugi.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/1/0435/3431/9776

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a040.bin
83d36e6ff0ba4395c921c48309fda06448211763834aee8dd5b977ef191ca685		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA040 5068 bytes
font_01_sfnt_off0000b195.bin
deca198a1e454712bce368c75f93065e3ed780334147e745e55c5157bafd67e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB195 14240 bytes

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