Malicious PDF — malware analysis report

Static analysis result for SHA-256 784a33c6060e093c…

MALICIOUS

PDF

47.4 KB Created: 2020-10-11 05:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ada42f5ebaf47dafe4d0d51dc6c3db8 SHA-1: 6a19445441c3ac0e2a03a1eb8b5549115e41a2bf SHA-256: 784a33c6060e093ca7f0f997c5b277f38e2f132a306b5f450ae6f56918b13be7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to malicious infrastructure. No scripts were extracted, and the family is unknown.

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=documentary+storyboard+pdf In PDF document text
    • https://site-1048531.mozfiles.com/files/1048531/dejukufonel.pdfIn PDF document text
    • https://site-1041770.mozfiles.com/files/1041770/mufidofapuforofazinuveni.pdfIn PDF document text
    • http://files.mkgcustom.com/uploads/1/3/1/4/131453397/1717418.pdfIn PDF document text
    • http://nodomume.asuenglishequestrianteam.com/uploads/1/3/0/9/130969114/d8f199001cdd5.pdfIn PDF document text
    • http://pigefur.sparklyshop.co.uk/uploads/1/3/0/8/130874285/dexazujabisevawove.pdfIn PDF document text
    • http://gedifo.artisanseaglassjewelry.com/uploads/1/3/0/7/130740166/pudobimiwizan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7875/3697/files/17362387126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6088/6694/files/54667961722.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7358/4289/files/command_modern_air_naval_operations_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/kh2_twilight_crystal_locations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5295/7335/files/montgomery_county_ohio_jail_care_packages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/5675/7667/files/45248482680.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5346/5767/files/what_is_angular_frequency_in_physics.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDF 5512 bytes
SHA-256: 77267b794a862b8741a4c2318efe8d92fab8ba5ca145d942fcbed9cc3d4bf7e1
font_01_sfnt_off00008e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E83 10192 bytes
SHA-256: be75abdc06a0f1666106ed6ba45ec3d7cfcd534dff6ac169e0647b92898d572e

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