Malicious PDF — malware analysis report

Static analysis result for SHA-256 573da09bccc504b2…

MALICIOUS

PDF

34.4 KB Created: 2020-11-04 19:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5b00b0e012cb1387fe31066fdc608a44 SHA-1: d934f96e01d24aae9f1d87eea2c12d99d2a62833 SHA-256: 573da09bccc504b2439de264f6b15bc57bfd48dd69d456f6a7eb398ed3cbb571
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 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://ggtraff.ru/123?keyword=farewell+to+manzanar+test+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413566/normal_5f9fe53ae660d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f92cba913099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5f906d659dc2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5f9e30af9a0f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369657/normal_5f9201ae0debf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5f9dc6dfa47bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5f9e3f18532f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5f8d1c3c30b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f8dc1f2788ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_5f9c7d52ddc78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f8f36bd790b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f90d84316333.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/1/0482/7290/0264/files/88573331301.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/lesitanefog.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_off0000498c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x498C 4928 bytes
SHA-256: 271781653766e83c592a62a1179174b5f4a7b864ce21150f750fb870b2c33856
font_01_sfnt_off00005a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A51 10236 bytes
SHA-256: 3dcfbe65416fdd7d0353954be77e1a65e7f445e5cbe3f87cc033eabf3a9bb371

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