Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74e01228111223b…

MALICIOUS

PDF

40.0 KB Created: 2020-10-08 11:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7965e69a84b5895d1f43b1e52c469a5c SHA-1: e36f83df66ca67a6c5becee77db3dc96fdfcc94c SHA-256: c74e01228111223be2d55ddee58c5b7858a246d99dfcfb195ecec7ebe780a7f4
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains URLs that are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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?keyword=decimal+place+value+chart+to+millionths+pdf In PDF document text
    • http://files.hudsonartseason.com/uploads/1/3/2/6/132696104/be7997511537e9.pdfIn PDF document text
    • http://files.katrinamatthews.com/uploads/1/3/2/7/132740930/wazuv-kujuvesebuvivu-palepili-supade.pdfIn PDF document text
    • http://zipalev.behsnews.com/uploads/1/3/2/8/132815180/3857014.pdfIn PDF document text
    • http://files.pakistanitutors.com/uploads/1/3/0/9/130969297/3307996.pdfIn PDF document text
    • http://zupit.repconw.com/uploads/1/3/1/4/131483830/f5673e71.pdfIn PDF document text
    • https://site-1037178.mozfiles.com/files/1037178/13435231328.pdfIn PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/dezisenabapovubegopuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f922dcce-1f7d-4f98-b00d-82a96bd99b89/84337386969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a6a6c3-18a5-47b6-bd07-a9d83023e974/mijejapisoselofapolego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1fe76cd-829b-4e4d-b6c4-a52bfa601329/govit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea782e9a-a9a4-4cd8-9296-bc5eb5335021/80367939453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5732/2903/files/applied_behaviour_analysis_personal_statement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7509/9041/files/de_soto_national_forest_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7897/8210/files/rudder_high_school_bryan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9720/9498/files/74289560990.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_off00005ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCD 5452 bytes
SHA-256: 217aeb8c8f229ad29946d14b20a5e615ab648810d55a72434091ebe835f291ec
font_01_sfnt_off00006f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F33 10376 bytes
SHA-256: bdf047dc87dfde6ce9ac2bcbf7a44ce9c9e04da1f48c1fe880e72e66b2a59fc4

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