Malicious PDF — malware analysis report

Static analysis result for SHA-256 5135550aaab1b895…

MALICIOUS

PDF

43.2 KB Created: 2020-11-05 17:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d79a75bc988ec8679acced9eefda62bf SHA-1: b0c03af7031a82c2ba5b98fed3ee719a19ad4223 SHA-256: 5135550aaab1b895fa2c863b9df64ac3711964e0dd3bc7c8f193a742f91d97d9
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or SEO poisoning attempt. The primary malicious URL, 'https://traffnew.ru/strik?keyword=georgia+colonies+economy', is embedded within the document body and is likely intended to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?keyword=georgia+colonies+economy PDF link annotation
    • https://duxuremi.weebly.com/uploads/1/3/4/6/134623812/1323250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406777/normal_5f92bab0ce209.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/purawuma/budgeting_process_in_management_accounting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c16f878-45a1-454f-8500-8fe3b1a20cd5/kagorilasef.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/character_sketch_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f5922c-da20-47a4-b22f-28c68727597e/yiruma_moonlight_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/dorukanirowuv.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/the_urbz_sims_in_the_city_gamecube.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/angle_bisector_theorem_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24813710-72db-4633-a4de-1b3396afe97b/ge_refrigerator_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997f59fd-2aa1-49b1-bde3-a9901ae90d7f/51914101476.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/zurekosurubikivejigo.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/l_architecture_bioclimatique.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/20481818120.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_off0000670d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x670D 5252 bytes
SHA-256: 6fd83b3a76342da32d31904e5bf767de573c579073768706e2507d0b7a9df8d3
font_01_sfnt_off000078df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78DF 11424 bytes
SHA-256: d24747667b168e231968855103049c12cde66b1d7c01cf7fec5bcb0b7fb2e7b4

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