Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6b4563ab08197b…

MALICIOUS

PDF

45.8 KB Created: 2020-08-09 16:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa91c82bc957b8345e1dd10d53d9ed7f SHA-1: 23d598c1858640d7b353e24c0ce4d34136fba3a4 SHA-256: 5d6b4563ab08197b3b3660ca4587041c466a9d397a4fe456fc3dc0f00955a071
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests an attempt to direct users to external content, potentially for SEO poisoning or phishing purposes.

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.cc/pify?keyword=cetoacidosis+diabetica+en+perros+pdf
    • http://files.classicmassagestudio.com/uploads/1/3/0/8/130814529/4986065.pdf
    • http://files.ibomusicalvoyage.com/uploads/1/3/1/4/131452733/3371117.pdf
    • http://files.chloecustomcollections.com/uploads/1/3/2/7/132712315/gububinusalaxu_nepulaxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7531/9448/files/zumikobizisako.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/52453088708.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/segar.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/robopomevavata.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/affaire_cahuzac.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/61405519778.pdf
    • https://cdn.shopify.com/s/files/1/0437/4075/8170/files/biochemistry_acs_exam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9773/5843/files/68250863444.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9802/files/15918683123.pdf
    • https://cdn.shopify.com/s/files/1/0450/2195/4206/files/pdf_converter_combine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10542261424.pdf
    • https://cdn.shopify.com/s/files/1/0429/5553/8591/files/rozefov.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/array_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/assembly_language_for_x86_processors_7th_edition_solutions.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_off000070b1.bin
62af3da59ec66ce9cd420ce05962a1772ea4493c6a8df5fd880381b3b65f67cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B1 5160 bytes
font_01_sfnt_off0000823f.bin
fecf4c3b6901a736a86dea5c57db043636316392d748af3217a42228eb99bd37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823F 11768 bytes

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