Malicious PDF — malware analysis report

Static analysis result for SHA-256 676bbff8a2d9e0ee…

MALICIOUS

PDF

39.4 KB Created: 2020-10-11 12:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 57bbf24c74132ba33326efb761e27977 SHA-1: 3f9de102770445f7c0e25d85ad8bb273fa08e013 SHA-256: 676bbff8a2d9e0ee531ba18957f943a3f6dc4369707d7a3560b39be4f9b084a3
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or disposable hosting. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://cctraff.ru/pify?keyword=nioh+smithing+text+farming as malicious. The document body, though heavily obfuscated, also contains this URL and other links, suggesting a deliberate attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/pify?keyword=nioh+smithing+text+farming In PDF document text
    • http://gosis.coastaldogwalkers.co.uk/uploads/1/3/1/3/131383309/gavepubaforuwi_tinevip.pdfIn PDF document text
    • http://files.coloradolawnservices.com/uploads/1/3/1/4/131408008/fff0f.pdfIn PDF document text
    • http://files.divebarblues.com/uploads/1/3/1/1/131163782/70d445f6c2e3e.pdfIn PDF document text
    • http://kadixuta.portholes.ccsps.info/uploads/1/3/0/8/130814933/89717a9467ad37.pdfIn PDF document text
    • http://files.todayhousing.com/uploads/1/3/0/9/130969243/vanamogukalazak.pdfIn PDF document text
    • http://lowixez.farrisins.com/uploads/1/3/2/6/132682883/0beebff4a8.pdfIn PDF document text
    • http://sewatup.jeffersonhighwayinoklahoma.com/uploads/1/3/2/7/132740541/nuxudevapivoraner.pdfIn PDF document text
    • http://files.onestepforwardcounseling.com/uploads/1/3/1/6/131606293/jelud.pdfIn PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/14945564427.pdfIn PDF document text
    • https://site-1042880.mozfiles.com/files/1042880/wididikimeden.pdfIn PDF document text
    • https://site-1036812.mozfiles.com/files/1036812/75385471374.pdfIn PDF document text
    • https://site-1037849.mozfiles.com/files/1037849/luniwa.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/dd27f983-d95c-43b8-98cc-effa6579bc09/97023186846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7e5146-d598-4c16-a28e-cee9c966f818/94725526353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8071d95d-537c-4481-a911-235ebdbf99ac/rerivak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112639c8-39dc-46e0-9e02-eb92213ff094/97588601599.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_off00005362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5362 5188 bytes
SHA-256: 6118b01d9f42adb191c1cd8b71c1eda45c6d17b6f6e2e64719175b7b9a8d628a
font_01_sfnt_off000064ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EA 14260 bytes
SHA-256: c531c023a784090eea0f7deffa91c8b6a6eb732e6afe3b9515e798b0a663267e

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