Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dac7104405bd587…

MALICIOUS

PDF

44.3 KB Created: 2020-09-30 11:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b2e0a8cb0c71f481e6b4c90f5e61723 SHA-1: 2ed440898329af16b87d9ff43a618b2032f4d0bd SHA-256: 9dac7104405bd587893bbe7e16e46f8d2f3e5512ddfc519c2b1f251e741a52cf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and contains links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with a large number of external links, many pointing to Shopify-hosted PDFs. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting a lure to a malicious site.

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://cctraff.ru/strik?keyword=estimation+and+costing+of+residential+building+in+india+pdf
    • http://files.hairs2you.net/uploads/1/3/0/7/130776558/d593ec2.pdf
    • http://files.tideofvibes.com/uploads/1/3/2/7/132740701/nilavivigogofu.pdf
    • http://womuwiv.northburmachristianmission.org/uploads/1/3/1/4/131453060/zedepom.pdf
    • http://files.rapportinteriors.com/uploads/1/3/2/3/132302736/wegojudigul-sisavunewuliwom-vupudexapiwufe-zejolad.pdf
    • http://files.afaparents.org/uploads/1/3/0/7/130739826/kareletobaguko.pdf
    • https://site-1037276.mozfiles.com/files/1037276/28694280810.pdf
    • https://site-1036886.mozfiles.com/files/1036886/vagofo.pdf
    • https://site-1037224.mozfiles.com/files/1037224/36665307441.pdf
    • https://site-1036932.mozfiles.com/files/1036932/zubibenezadukoxiduxanir.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/about_us_template_for_travel_agency.pdf
    • https://cdn.shopify.com/s/files/1/0428/1512/7708/files/7364704191.pdf
    • https://cdn.shopify.com/s/files/1/0439/5086/6590/files/xajopederuxodavox.pdf
    • https://cdn.shopify.com/s/files/1/0430/6809/6661/files/kirigituxeba.pdf
    • https://cdn.shopify.com/s/files/1/0434/5846/1863/files/66538535129.pdf
    • https://uploads.strikinglycdn.com/files/2e66a5ed-8301-4967-bff3-d8ec8653f64a/91090261138.pdf
    • https://uploads.strikinglycdn.com/files/a181577b-13da-45d6-ba30-4aff60f033e9/54817569651.pdf
    • https://uploads.strikinglycdn.com/files/cbd8f0a1-f511-4ec2-b3eb-3b577b1d0751/18686534732.pdf
    • https://uploads.strikinglycdn.com/files/08cfd598-f8f0-4ed3-8357-6aa3a2ac104f/89551951867.pdf
    • https://uploads.strikinglycdn.com/files/3510d58f-4c32-4757-95bf-10289add8089/dowovunuwujubu.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/
    • https://cdn.shopify.com/s/files/1/0439/5086/65

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d9b.bin
0b26d11a2147e313e9b65f4b6efea9ebb8242e1f8fa8c4817624e9fefb0221f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9B 5572 bytes
font_01_sfnt_off00008077.bin
eeb3d6123c5d567fc88bead5b6c78fb11c15491437180c7ebb004babbba03baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8077 10120 bytes

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