Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db2a07365229759…

MALICIOUS

PDF

42.7 KB Created: 2020-11-03 08:35:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 196e3f8e3e6fad4ead646cb3d486308d SHA-1: 1ec5608f32e3516fef2c121990fd9bd565fe916c SHA-256: 6db2a07365229759a5c43e681e099b7f091ba7db356d2c072d2058d17bbd1617
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=irs+holtsville+ny+letter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5f9b04ceee336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5f99f9c331a36.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/1/0268/8303/1233/files/reason_7_crack_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9928/2336/files/dolor_abdominal_cronico_en_nios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1124/9580/files/72412647017.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/93305845069.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/wadatozamabodopedumov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2575/9893/files/baby_essentials_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1678/1475/files/toduvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9314/0675/files/of_mice_and_men_george.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febabe70-ff15-40fc-9cf1-e1f28d92e9d3/linwood_elementary_school_pa.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_off00006870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6870 4664 bytes
SHA-256: 5e0ce41918477e022f06cbad170599fab93f3d5f2d25e40c5cd6d123c482b664
font_01_sfnt_off00007850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7850 11236 bytes
SHA-256: 51638c8bb3e67f72770c838056e1d3e3152b23648670984b837fe4614a984cab

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