Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb18f3b9166c1e6…

MALICIOUS

PDF

86.8 KB Created: 2020-11-26 10:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3f0bf96fa13545f924418c6ceea93597 SHA-1: 63f365c1df3f91fd4d36defd09ce10e3bcfba150 SHA-256: dfb18f3b9166c1e65b3b0c5fe06aacc54cc2428cf077ece622cd82133c10325a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at `https://cctraff.ru/aws?utm_term=innocent+man+john+grisham+free`, suggesting the document's primary purpose is to redirect users to harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=innocent+man+john+grisham+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_5fb68e90d7f74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_5fb321c71378d.pdfIn PDF document text
    • https://rifeseroki.weebly.com/uploads/1/3/4/6/134698736/mozilozazateno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_5fbc0c05d5729.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/0fb35f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5f9573184beb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458622/normal_5fa4d4fa992d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_5fabbd54d686a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_5f9e09708902d.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/gasodamuza/damosib.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/41168556770.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_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 5276 bytes
SHA-256: fa413805452760a94200f9d71d19f67838694e8e91dfae769a1830d25b8e06ac
font_01_sfnt_off00012c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C81 9884 bytes
SHA-256: e2aed556ce1838d69ea6588adde0867210d859c47754ef068d1194f22c6017cc

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