Malicious PDF — malware analysis report

Static analysis result for SHA-256 910497ee2a4ccdfc…

MALICIOUS

PDF

54.9 KB Created: 2020-08-31 05:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7e9712c70c168fed2e27bf7493bf00e SHA-1: 3c8d06b1c1ceba821cf843ac4be397af4471a223 SHA-256: 910497ee2a4ccdfc9de630f0cee1d3848fbedf97108d1ede4ec3154566cfcd82
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector's target. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to a malicious site under the guise of providing contest-related biblical questions.

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/wix?keyword=preguntas+y+respuestas+biblicas+para+concursos+pdf
    • https://cdn.shopify.com/s/files/1/0432/9052/5849/files/disunegubafivowoboxevaza.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/printable_doubles_math_facts_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/nice_guidelines_cardiovascular_disease_prevention.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/93883681588.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/besaranu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/nimeluvusomogimerurovexib.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/teaching_approaches_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0350/files/rivovapabimizuxujuluvuwu.pdf
    • https://cdn.shopify.com/s/files/1/0461/3518/1465/files/informasi_obat_asam_mefenamat.pdf
    • https://cdn.shopify.com/s/files/1/0448/2321/6290/files/53316685390.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/31210247114.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_off000094f3.bin
04e2b97246b95fb02dc059297b71fdc9e86262f89df6e679257b551e272d9412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94F3 5564 bytes
font_01_sfnt_off0000a7e2.bin
02075f906da4bdee63f87ee52f5e7da9e22f5c333a998802bcfffce34bfbe179		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E2 11260 bytes

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