Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb08f83ee247ebce…

MALICIOUS

PDF

39.9 KB Created: 2020-11-01 08:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 48f6ec9b8415528ace267240b779ce67 SHA-1: 96e86c3ce3034bd5519b5679cb5867cfd7a21074 SHA-256: fb08f83ee247ebce2ca41178ec2f8db530e703045fe8cd9bc5c70ccb75b0cff9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or link farms. The primary malicious link identified is https://gettraff.ru/aws?keyword=eureka+vacuum+manual+model+as1061, which is likely used to redirect users to further malicious content. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/aws?keyword=eureka+vacuum+manual+model+as1061 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_5f992894c31ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5f9002ae78b90.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4867245.pdfIn PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/musiwuja_vivejoxiki_wivigusor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5f8eede6ee464.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/bf478f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5f9de88c43e0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a3f450a5-1116-443e-ab9a-5564f786f2b2/40418773393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88822efe-9276-4a1d-8cf2-ab6138e2d5b8/xikiwukumofivamudarewunad.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/14831916041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a33dbe-cb86-4900-9fba-0f80a0ef9026/menojisezisulubezusod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d032707-9dc7-4057-acbc-fe1657d1b9e3/vitifazixexevekulele.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F18 5268 bytes
SHA-256: 606d9b74477a0de123d1e8c89352eff8e894f8faddba25a923d4eab31e0d6c8f
font_01_sfnt_off000060ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EA 10608 bytes
SHA-256: 80d944d4f5550f157bb8a042f395d7951030a698bdcc44b4172f342c45e00a10
font_02_sfnt_off000084c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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