Malicious PDF — malware analysis report

Static analysis result for SHA-256 72dc58da008bf691…

MALICIOUS

PDF

52.6 KB Created: 2020-08-17 14:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51e8052171ea8e977a92ebeecab68dfe SHA-1: 1bc09f53ba96118705dcd9d37b1abf0e67d9d23f SHA-256: 72dc58da008bf691a80c6be032d2ec0e9e29fb32781755aac4db3cf5651ad98a
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting an 'incident report' lure. The presence of multiple PDF links, many pointing to benign Shopify URLs, suggests a link farm designed to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.cc/pify?keyword=incident+report+sample+letter+for+broken+item
    • http://dewitujiz.dcaaems.org/uploads/1/3/1/6/131607095/a411cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6303/3502/files/apron_sewing_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/3662868224.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4023/files/8680885861.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/93555500816.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/selena_gomez_slow_down_lyric.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/canada_visa_application_form_in_oman.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/18623090489.pdf
    • https://cdn.shopify.com/s/files/1/0454/3479/8238/files/51179759259.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/28744946449.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/sofuvizemudetinek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34707652888.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/62337180333.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008061.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8061 2828 bytes
font_01_sfnt_off00008a5b.bin
acb4fb2a83e98237086b83181d0ed2a61fb2d3e5fd4bf7d75f86559450606d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5B 5440 bytes
font_02_sfnt_off00009cb4.bin
be0d3763f0a16a5aa90409e7971a84c79a224d183066568e80a2baa46f491fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB4 11928 bytes

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