Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9f88c37a12aa4f…

MALICIOUS

PDF

67.4 KB Created: 2020-11-18 16:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 08de05663ebd5142ebcb72f94f291aee SHA-1: ba0ce1ae62800d70f99ce9d357220357bb85ad29 SHA-256: fc9f88c37a12aa4f75fd75eba0c697c3d911239be0df8e75ca112550f1546424
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 large number of embedded links, identified as a link farm, directing to various external sites. One of these links, 'https://gettraff.ru/strik?utm_term=hallmark+keepsake+ornament+value+guide+2016', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its intended lure beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?utm_term=hallmark+keepsake+ornament+value+guide+2016 In PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/mebudikog_sumobut.pdfIn PDF document text
    • https://lubipufubuk.weebly.com/uploads/1/3/4/5/134597980/keruritomi.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/6618699.pdfIn PDF document text
    • https://lolewifewo.weebly.com/uploads/1/3/4/7/134710585/4fedaaf.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/55a1e0a.pdfIn PDF document text
    • https://zukuvexoxowi.weebly.com/uploads/1/3/4/5/134597017/4728698.pdfIn PDF document text
    • https://duxobibalarig.weebly.com/uploads/1/3/4/3/134360367/4de81.pdfIn PDF document text
    • https://luxederobidurip.weebly.com/uploads/1/3/4/6/134603039/bifise.pdfIn PDF document text
    • https://lalusaguru.weebly.com/uploads/1/3/4/6/134611329/gekov_budonikefodu_sawixedosasagi_dubebutig.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/dinigugaxej/browser_app_android_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557f4c1b-a90e-4e05-ac59-f3f7f7b25c70/lifomufesixezax.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/allah_hu_allah_hu_qawwali_song.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/rahasia_meede.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/equivalent_resistance_problems_for_class_12.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_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 5844 bytes
SHA-256: b246dbaeff9c8c3be7d9d7c678437513cca95504f8a4940fc146f53326273e8f
font_01_sfnt_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 11028 bytes
SHA-256: b8baecfe7cd3b5446ab137d30e17a20eb0a5ff72d73ba1dfd951e72c142fc10d

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