Malicious PDF — malware analysis report

Static analysis result for SHA-256 8874c5c0c825205f…

MALICIOUS

PDF

37.5 KB Created: 2020-10-31 08:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bffb9c26575d89f7cd128414350f933a SHA-1: 22798aeaa2ee409939eb4c187fa99f19195d43b8 SHA-256: 8874c5c0c825205fddfdd5520c13f08501af27ec688327216131c7a44d42920e
154 Risk Score

Malware Insights

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

This PDF file contains numerous links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract search engine traffic. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click the malicious URL, likely leading to further compromise.

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://cctraff.ru/wb?keyword=film%20production%20company%20business%20plan%20sample%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375703/normal_5f8b8ec8792b7.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/666056032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_5f9c9d8beeea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f8de69fb93ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f896a59c8cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f94df2519c45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f8ac92d8c5e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1a5020-5297-4c75-a0af-558360d35dc0/acid_and_alcohol_reaction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615b4b1f-f750-47eb-9909-3ba05fdc6edc/63149467411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02330ad0-c038-412d-b498-a1359cb7d299/under_the_sea_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6099c3c3-c7c2-4a96-abf2-7f706064f1a4/punozoralefubuluxaburem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0925/9674/files/89736421642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4291459b-ed4a-4bfe-afaa-f8c5a3768cd8/59606419284.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_off0000531d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x531D 5496 bytes
SHA-256: e6430b13a1eb670e78af5f9803887e8f57ff10a95372a5d10853f313f128642b
font_01_sfnt_off000065bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BB 10284 bytes
SHA-256: 868c92f5ecf98f3af9f8639b080a98419138508cb1f1e7b82ec2edf6292ca435

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