Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec43b948a565e206…

MALICIOUS

PDF

41.3 KB Created: 2020-08-19 06:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b83ee2c840b5c197f8aaf571728b20be SHA-1: 5c92821cdfcf03d4e725ab8101a07a93862c0c46 SHA-256: ec43b948a565e2062a1a08e54d3ee6da038a0fd04a1a4822aaed2330a03adec3
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=the+constitutional+convention+of+1787+worksheet+answers, which is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain references to this URL and other PDF links, suggesting a social engineering lure related to a worksheet. No scripts were extracted from this sample.

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=the+constitutional+convention+of+1787+worksheet+answers
    • http://files.austintowngrace.com/uploads/1/3/1/4/131437194/musidolo-fupetifebafula-sedobimalo.pdf
    • http://fetiv.aaronmossgamedesign.com/uploads/1/3/1/0/131071157/rifubor.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1155/files/14529975995.pdf
    • https://cdn.shopify.com/s/files/1/0451/7625/8711/files/xifazivegax.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/dekekorakotodaraf.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4693/files/66706219209.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/oracle_sql_queries_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zurutadodusabexefiba.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/rivokemanujubifatu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2554/files/29569550315.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/4297122888.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/sigidemopovesexinamen.pdf
    • https://cdn.shopify.com/s/files/1/0448/0860/1762/files/9924912776.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/16441053221.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_off00006365.bin
2649f11117dd687c8e04d8c5695cd1aad2b9395dfa029ab708cf94a631914297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6365 5460 bytes
font_01_sfnt_off0000760e.bin
7450d4c9716f30f34f1634f17eed0949c0da4a32d8442a57dde370af0d761c76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760E 10024 bytes

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