Malicious PDF — malware analysis report

Static analysis result for SHA-256 739d4647972123a6…

MALICIOUS

PDF

41.0 KB Created: 2020-11-01 10:38:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a53ab646408177b0dd3094c1e8673fa9 SHA-1: afd4674436295502327112720e62d5b70b1e828e SHA-256: 739d4647972123a645e2cdf2f9e11aa2944bfd50cc0462da7633e02c1cc43ef9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://gettraff.ru/aws?keyword=the+golden+claw+skyrim+code', suggesting a lure to a malicious site. The presence of numerous external PDF links also indicates a potential link farm or SEO manipulation tactic.

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=the+golden+claw+skyrim+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427785/normal_5f9a678e3ead5.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/9542354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427828/normal_5f9c72cb9fe7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f908af8483ef.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/tiwinagaturixet_banejosukeribut.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/mefadedosuw/movomiwibipimunimot.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/51051507222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa970f7e-04fa-427e-aeb2-cea4b3f122db/zimedugeperaka.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/kuzobukupu.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/epson_5040_refurbished_projector.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/65460020463.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/xerudajexidom.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/gipulogaxu.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_off00006221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6221 5560 bytes
SHA-256: 29957a62f9a5aa77b2fd63356c3eab4b06814e2792f1bf536026e1a3b6e96ea2
font_01_sfnt_off000074fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74FB 10304 bytes
SHA-256: 9517c1e7c73aaf963f3cd274d49f7c34b293c16050d80035ab340b63063ddc80

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