Malicious PDF — malware analysis report

Static analysis result for SHA-256 537a8004d3acbd13…

MALICIOUS

PDF

105.9 KB Created: 2020-11-05 16:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d711c66ea5cc8a424589167432fb08c2 SHA-1: 27d4be4194c5e78c1b206e8947e76564207e6eae SHA-256: 537a8004d3acbd13a4b220ff8a24a4297362cc3e5a26e8cee1e547b0793b83d6
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?keyword=words+that+start+with+the+stem+mis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5f90ff93064be.pdfIn PDF document text
    • https://bizavurodetilu.weebly.com/uploads/1/3/4/3/134391156/luvawaramom.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/83905a54a030772.pdfIn PDF document text
    • https://jusemeki.weebly.com/uploads/1/3/4/5/134506960/damiwabopigom.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/mogelebolep/free_home_history_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/sedozumorolofo.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/89200544518.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/owner_operator_trucking_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/example_of_adaptive_behavior.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/jinovizib.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/south_america_customs.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/ganifatapesinesopek.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/nafelevokenuzivuduz.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_off000154cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CC 2888 bytes
SHA-256: 604725ebf9bf0d9ab2bcf42cb3b9eb1946ba017bf99d5c2e6531ff47cfbc4b7a
font_01_sfnt_off00015f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0F 5136 bytes
SHA-256: de149abc46c76c1ee1adf54d9e30ea105ed40bccb2200feb5c702d9321bb7876
font_02_sfnt_off00017073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17073 12604 bytes
SHA-256: 13bbaf113871a5e702f6682af311e3a81868719831a6c5d6bba0ef20a1a22f4d

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