Malicious PDF — malware analysis report

Static analysis result for SHA-256 45327e2f28e7979a…

MALICIOUS

PDF

41.0 KB Created: 2020-08-15 02:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3cacf19733238b1bee59594b0d09deb SHA-1: c768b0c6b5b8147924f80c6f1231d84ece5b6f82 SHA-256: 45327e2f28e7979a6d6011400c10e795606635abcefe2adc00db442528b075f0
150 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, including one pointing to a known malicious redirector at `https://ttraff.cc/pify?keyword=independent+and+dependent+variables+worksheet+pdf`. The document body, though heavily obfuscated, appears to be an attempt to disguise the malicious links as an educational worksheet. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=independent+and+dependent+variables+worksheet+pdf
    • http://files.nmwordprocessing.com/uploads/1/3/1/4/131453713/2764709.pdf
    • http://files.lakechristianministries.org/uploads/1/3/0/8/130874646/703dfb.pdf
    • http://topesejid.annettetammart.com/uploads/1/3/0/7/130775506/vipami.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/voltage_divider_rule_and_current_divider_rule.pdf
    • https://cdn.shopify.com/s/files/1/0446/6851/8563/files/united_states_abbreviations.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/25034089196.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/programa_bac_romana_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/6820/9817/files/mafevox.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8389/files/teorias_e_abordagens_da_administrao.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9430/files/vuxoximejamusifasomawimew.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/87269895879.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/75118112208.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_off00006032.bin
cad4ddfac569cb296c9ae8c596042a2b005933ffe6b7de8db847815f221a3a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6032 5424 bytes
font_01_sfnt_off000072a7.bin
eb1ad1358491811a9aedbdcc1d690d86b9234876d717ef1a48136cf19a6af0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A7 10836 bytes

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