Malicious PDF — malware analysis report

Static analysis result for SHA-256 731da39e1043c523…

MALICIOUS

PDF

41.9 KB Created: 2020-08-15 01:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca3fd2b3340470728a2685a2ef8b1e5f SHA-1: da1070b5f6a2f67c182c5830680e325a91d0271f SHA-256: 731da39e1043c52352f5c9a6db0c7d9cf602aa957985a3d7cb5fdc38cab6147a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'software for data analysis' and includes the malicious URL, suggesting a lure. The presence of numerous Shopify-hosted PDF links indicates a potential link farm or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=software+for+data+analysis+chambers+pdf
    • http://files.dianamarysharpton.com/uploads/1/3/1/3/131383821/5295908.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0054/4931/files/bukegize.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/producer_consumer_c.pdf
    • https://cdn.shopify.com/s/files/1/0429/5557/1353/files/gheorghe_mure_c8_99an.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6578/files/install_python_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/9629/4051/files/vadowutumujefobuxenigid.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/ruzasoludu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/gikaporelajepob.pdf
    • https://cdn.shopify.com/s/files/1/0431/2589/9426/files/gisowowunuvita.pdf
    • https://cdn.shopify.com/s/files/1/0432/1945/2072/files/huge_size_5e.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006502.bin
6503d9e5591366c0a3657969de761239bb89b716c3071ba54dd0358455b0add9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6502 5832 bytes
font_01_sfnt_off000078b7.bin
6c619978b296fc5aab376c3e0fb757f8f804b89d259e4616ee8dd5a7354cf248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B7 10108 bytes

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