Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa4c85168b3b2ed…

MALICIOUS

PDF

38.9 KB Created: 2020-08-24 00:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c1ecab631310416992f1290766277ae SHA-1: 1ccefaaac4e94de99c65da0c4f1df7708ec2b79c SHA-256: 6fa4c85168b3b2ed8606716cfdb394bf4aa837de243c0ce9e4b9527a9d04f1bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links. One of these links points to a known malicious redirector, suggesting an attempt to lure the user to a harmful website. The document body is heavily obfuscated and contains what appears to be junk data along with URLs.

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=bourrache+onagre+nat+et+form
    • http://xadegi.etop-hk.com/uploads/1/3/0/9/130969191/nusuxebofalalepen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6893/2767/files/star_wars_piano_sheet_music_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0435/0686/0187/files/womedekaja.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/15946832353.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/cat_420e_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1266/files/c_to_f_conversion_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/valunax.pdf
    • https://cdn.shopify.com/s/files/1/0435/4716/4826/files/antremanlarla_matematik_4_indir.pdf
    • https://cdn.shopify.com/s/files/1/0437/6697/2577/files/fundamentals_of_organic_chemistry_mcmurry.pdf
    • https://cdn.shopify.com/s/files/1/0441/3403/9704/files/19333598993.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_off00005aaa.bin
f507ee6878f34006b8212d12b78b94ce339df3c64da23c03070a446497cf4089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAA 5132 bytes
font_01_sfnt_off00006bfb.bin
6045a30f35170abd0c6004de7cf6e85a04074c9094f95e85564f4504045a02da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFB 10444 bytes

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