Malicious PDF — malware analysis report

Static analysis result for SHA-256 258365ae4936210f…

MALICIOUS

PDF

75.3 KB Created: 2020-11-12 15:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20dcf65bc3d07ab1979e602642059850 SHA-1: 76a9f8d7b2582fc4c86cf45d589e79730ac205bf SHA-256: 258365ae4936210fc2a9538013050feddf1bcb65b61f012f041fea76c2dbe317
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results and distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious intent to redirect users to harmful sites.

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://cctraff.ru/strik?utm_term=moosewood+cookbook+gypsy+soup
    • https://xesapexoxes.weebly.com/uploads/1/3/4/6/134633169/bc69199.pdf
    • https://gukijofajileraw.weebly.com/uploads/1/3/4/3/134392650/78bf29.pdf
    • https://detaliwaka.weebly.com/uploads/1/3/4/3/134340587/fizerofipenoter-dubiguwititavel-pawej-gepowuvo.pdf
    • https://setojeduvesile.weebly.com/uploads/1/3/4/5/134587971/048fe584202d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/19d9a2ef-154d-4c72-8335-ae45d8ff43eb/neponerapevosorujarobim.pdf
    • https://uploads.strikinglycdn.com/files/44fa9acb-85fc-4f68-92d9-102acb6f2eec/notatidasifujuxage.pdf
    • https://uploads.strikinglycdn.com/files/0c4db8da-f6e0-4094-a8ff-968e37215414/beranuzabekunanajutupiv.pdf
    • https://s3.amazonaws.com/najubu/apsc_exam_question_paper_2017.pdf
    • https://s3.amazonaws.com/xifabilejilab/diff_and_sum_of_cubes_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/7babb838-d3bd-4135-8a8d-0fb9572216fc/unblocked_games_66_slither._io.pdf
    • https://s3.amazonaws.com/tiluwisulepam/xajumavisokib.pdf
    • https://s3.amazonaws.com/rizezobabub/mogevazexiruxibixogolulo.pdf
    • https://uploads.strikinglycdn.com/files/d1a8b349-7f7f-49b7-b85b-5a1f4426dbec/rowaxelixekinuzuxizi.pdf
    • https://s3.amazonaws.com/nemafu/gomatufejogukon.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c877.bin
b3daa2595bf216912b5a1eeaa06937fb83d24ab3c3ca5f5e42ec9f13fa702f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 5304 bytes
font_01_sfnt_off0000dac0.bin
190a553c9e7e218aa273aee7d21490add3f4c8bf999d7b87cd9ca4910f436e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 15240 bytes
font_02_sfnt_off00010b3e.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 16204 bytes

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