Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb843cc87652132c…

MALICIOUS

PDF

45.8 KB Created: 2020-11-07 00:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 527b352b8118fb2c8010b5a2e0dda1a2 SHA-1: 22370e44242d936442ad4e9333099991982a09b7 SHA-256: fb843cc87652132c13678cd45f09364828ef7ecbaf61464c09c43c66cb417aca
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, many of which are part of a link farm and point to external PDF documents. One URL, https://gettraff.ru/aws?keyword=entisols+soil+type, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is likely used for SEO manipulation or to distribute further malicious content.

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=entisols+soil+type In PDF document text
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/didimifulusi-kubitil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_5f8efb26d7f53.pdfIn PDF document text
    • https://joxetoxuluf.weebly.com/uploads/1/3/4/3/134391367/97777e.pdfIn PDF document text
    • https://gekitudijelal.weebly.com/uploads/1/3/4/2/134265938/1293084.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/c7333136f.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/bikebuduvud/41439925862.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/apk_sister_location_download_on_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/reading_fluency_by_grade_level.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/everstart_1200_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/zopadevipekezewi.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/2017_toyota_highlander_xle_manual.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_off00007696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7696 4568 bytes
SHA-256: a14194f516c5d36921635859ce487696c3571e463e019cce12c7a9df5dc359f2
font_01_sfnt_off00008642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8642 10916 bytes
SHA-256: c5dddc924f0be5e40622d684cd8ade6fd7dadfe67c285d86b0c56a7629d78f97

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