Malicious PDF — malware analysis report

Static analysis result for SHA-256 a952eb912048d5b7…

MALICIOUS

PDF

43.7 KB Created: 2020-10-27 20:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 86679a065207c72fae4312dac70b3f20 SHA-1: 3414a703db4a7864b8eb16a10b8cd8a87c3560c0 SHA-256: a952eb912048d5b7a0bfc7f77cd5f7cba770d0774b0f83a17152c0ef8411c3ca
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm designed to appear as a free download, but the primary link redirects to malicious infrastructure. The ML classifier and critical heuristic firings strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for further exploitation.

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.com/123?keyword=fanatical+prospecting+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f8c88d9b5272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5f8c001fa1f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f924145937f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_5f94359a84c8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f8aeeac8c8ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5f89875a71319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5f8c408343c63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5f8c771186d3d.pdfIn PDF document text
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/tadisinelipoku-nelus-sedelojovare.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/6533331.pdfIn PDF document text
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/dider_javurakakugejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5f958aac9533d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f8884cfdb88c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/julaxel/army_apft_standards_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/39175844354.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/allah_ke_99_naam_ki_fazilat_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/2019_calendar_with_karnataka_holidays.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6506/8699/files/87125564927.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8951/3634/files/muscle_food_cooking_instructions_chicken_sausages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0996/4735/files/wifeboxaki.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_off00006d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D46 5372 bytes
SHA-256: 1ea6741ac63cb43e077e6405ab20b5c83376dedd7fce3ce9df0c200fd4fae1e0
font_01_sfnt_off00007fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA0 9964 bytes
SHA-256: 357f8c7190de646b772330146d59e96edf258be6b5698e6dff2adc2e7fa4a08b

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