Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47666697150c25a…

MALICIOUS

PDF

44.0 KB Created: 2020-10-28 10:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9325132cddf22933e7210e8fe2ee51d4 SHA-1: 7fae69b18da9c5c581c8d006bc57daeb3230b4c0 SHA-256: a47666697150c25a76c3490f3deacac4d351af99b77326f01c31fbcd3cc12e6d
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to manipulate search results or distribute content. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence score support a malicious verdict.

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/123?keyword=holmes+stand+fan+with+remote
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5f8c9178d7af5.pdf
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5f93da6aad260.pdf
    • https://cdn-cms.f-static.net/uploads/4417414/normal_5f9657ae21db5.pdf
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f873a6a5bdf8.pdf
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/9700181.pdf
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/119094.pdf
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/2511602.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/676fd387-0789-4a07-84c7-340f8acf6391/62547863750.pdf
    • https://uploads.strikinglycdn.com/files/0f6acae0-702a-44e0-8ded-56f794bb12ee/pesquisa_exploratria_segundo_autores.pdf
    • https://uploads.strikinglycdn.com/files/115b2478-a2ef-419f-9e9e-33bf22a55cc1/dedojavewudepukos.pdf
    • https://uploads.strikinglycdn.com/files/42148a68-0504-4272-bebf-7eaa79c9f09c/dasogapodofiregabukudiru.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/grade_2_english_worksheets_sri_lanka.pdf
    • https://cdn.shopify.com/s/files/1/0435/4483/8303/files/scholastic_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/3543/3882/files/anchoring_script_for_international_conference.pdf
    • https://cdn.shopify.com/s/files/1/0482/8712/1572/files/taotronics_bluetooth_headphones_pairing_tt-bh07.pdf
    • https://s3.amazonaws.com/subud/90058973170.pdf
    • https://s3.amazonaws.com/fejififimaketo/pdf_file_editor_for_windows_10.pdf
    • https://s3.amazonaws.com/takateg/wavemizowotosafitebe.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/kikabajegudulebugomarid.pdf
    • https://cdn.shopify.com/s/files/1/0268/7903/3518/files/voice_grammar_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9279/3757/files/slope_intercept_form_activity_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0481/4038/6455/files/tufts_disorientation_guide_2020.pdf
    • https://cdn.shopify.com/s/files/1/0502/8410/1790/files/fantini_cosmi_intellitherm_c55a_manual.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_off00006cbb.bin
aad7b60225182f3d2890483252b87937e6a5dadc52e3e3b6bff50cacd87f29db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBB 5200 bytes
font_01_sfnt_off00007e47.bin
41324e99a79ec4655ac7503da1b745b8742d405d87860e4db340e5fde3a7d75d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E47 10832 bytes

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