Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d33889d9e261b0e…

MALICIOUS

PDF

41.9 KB Created: 2020-08-18 20:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7680a1b175c8756890fb424c19cb5c67 SHA-1: 732ff93c8b610a1131f30f116199e2f56c8f7225 SHA-256: 0d33889d9e261b0e12a578295f2739237aeaa45ba4ae62285e6d499fc026737b
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, identified as malicious infrastructure. The document body, though heavily obfuscated, also contains the same redirector URL and numerous other links, suggesting a link farm or redirection attempt. 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 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.com/pify?keyword=corten+steel+sheet+sydney
    • http://files.decaturparents.net/uploads/1/3/0/9/130969435/3e51bd909488f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/59899104357.pdf
    • https://cdn.shopify.com/s/files/1/0437/3017/4113/files/cet_2020_karnataka_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0443/5417/5132/files/catecismo_romano_o_catecismo_do_concilio_de_trento.pdf
    • https://cdn.shopify.com/s/files/1/0430/8015/5289/files/10164481944.pdf
    • https://cdn.shopify.com/s/files/1/0431/4585/5137/files/jigapumogusokurunef.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2275/files/55484032496.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/denakevomulon.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/38492490581.pdf
    • https://cdn.shopify.com/s/files/1/0437/7178/9469/files/antioxidantes_exogenos.pdf
    • https://cdn.shopify.com/s/files/1/0432/6935/7728/files/54158013120.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/24715400471.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_off000068fe.bin
4836aad968f3686c0e6135fe03ebe951d5a2cfd123c6860c4a1d0000ed81acca
pdf-font-stream PDF embedded font (sfnt) at offset 0x68FE 4708 bytes
font_01_sfnt_off000078ed.bin
8827c381256dc3b185030d6d1659a4bd89f91bbe8a8659e9eee590af507c801e
pdf-font-stream PDF embedded font (sfnt) at offset 0x78ED 9996 bytes