Malicious PDF — malware analysis report

Static analysis result for SHA-256 a094ccf6538d7e47…

MALICIOUS

PDF

46.5 KB Created: 2020-08-10 07:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac90737a7c8234c4f4a02d57b94e9c8d SHA-1: 3f0004d63d9e17612fcd241e692c0a60b22520e4 SHA-256: a094ccf6538d7e47ed892e87597f1cbba12a482490f3ee2ab2fd8f167630f3ab
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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/pify?keyword=list+of+verbs+and+their+nouns+and+adjectives+pdf
    • http://files.kerrybbarbera.com/uploads/1/3/1/3/131398542/31ca960a5.pdf
    • http://files.theuilanifund.org/uploads/1/3/0/8/130814050/dorugapobod.pdf
    • http://files.northcoastknitting.org/uploads/1/3/0/9/130969708/jizobigenelebatu.pdf
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/51121634512.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/understanding_financial_statements_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/0995/0367/files/98083134941.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/rational_choice_in_an_uncertain_world.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/zedamiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7710/files/6668198917.pdf
    • https://cdn.shopify.com/s/files/1/0431/4634/6658/files/current_ratio_analysis_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wuwikeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/7887/7337/files/chemistry_the_central_science_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/6090/4615/files/43003802912.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/optek_control_4000_manual_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/92936468745.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_off00006c63.bin
758aaa76199ddaecd49d030fdd37cdd30ddcd7dd0764ab69cdb71562473e2c01
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C63 5428 bytes
font_01_sfnt_off00007ee0.bin
f410515ad6788ecd70cd3a6d08704771653101e3004e5f83a64c74c7f7f8a0b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE0 14780 bytes