Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96a64aa99bf0af3…

MALICIOUS

PDF

42.2 KB Created: 2020-10-31 08:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 33961fc18c123bd6db4b316e7fb649a6 SHA-1: 716e776d6e756bfbbd7f38b96e12428bff9213be SHA-256: e96a64aa99bf0af3ba73caee876dc0f16bea48a381d7c1c8ec06db11024ec3f8
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to manipulate search engine results or lead users to malicious sites. No scripts were extracted, but the presence of numerous links points towards a phishing or SEO manipulation attack.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/aws?keyword=pennsylvania+dermatology+partners+douglassville+pa In PDF document text
    • https://jojawetoterul.weebly.com/uploads/1/3/4/4/134404105/155f9e940f12.pdfIn PDF document text
    • https://xuvarilanagore.weebly.com/uploads/1/3/4/4/134470983/wepuguk.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/vitevozazedadusose.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/5814302.pdfIn PDF document text
    • https://kufesolujuxubi.weebly.com/uploads/1/3/4/3/134373324/pobubilob-tukolopobafedi.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/7a5f9a48.pdfIn PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/fa105f.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/juful.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f8910e1dd73e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5f9cee666316b.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/muvojugejoxip/fisica_capacitores_exercicios_resolvidos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7421/6625/files/greek_god_goddess_of_weather.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_off000066ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EA 5444 bytes
SHA-256: add4fcab7ea1dda6f302fef0b25c53838e2c9eb15b76721a1cc0b8893dc491e4
font_01_sfnt_off00007967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7967 10248 bytes
SHA-256: b9c6e79d416ec6576943f15fa8b6861179fbd529989d15a6b6912483933b56ad

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