Malicious PDF — malware analysis report

Static analysis result for SHA-256 670282416053a5b1…

MALICIOUS

PDF

45.9 KB Created: 2020-10-01 19:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 46118d6274180bd947409034c4686cf0 SHA-1: 637ba6142048ef1bad029de379d6db183098b27c SHA-256: 670282416053a5b1aa056309a43e0b99488bf7032ae172da5f94ee33c8b35495
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that is also flagged as a malicious redirector, suggesting an attempt to lure the user to malicious infrastructure.

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=becker+cpa+auditing+pdf In PDF document text
    • http://rixodono.phillipsmathandphysics.com/uploads/1/3/2/8/132814838/c8eff77eb0812.pdfIn PDF document text
    • http://files.robertacarr.com/uploads/1/3/1/4/131452959/midomemamokovu.pdfIn PDF document text
    • http://wuripipa.vuongholdings.com/uploads/1/3/0/7/130776474/gukavenokonuf.pdfIn PDF document text
    • http://solefotid.sarahbutcher.com/uploads/1/3/0/7/130776131/315027.pdfIn PDF document text
    • http://files.eventsmithphotobooths.com/uploads/1/3/0/9/130969036/luzulapemu.pdfIn PDF document text
    • http://refumugek.culvercitysymphony.org/uploads/1/3/1/4/131453274/629091.pdfIn PDF document text
    • http://files.itsgreenupnorthgardens.co.uk/uploads/1/3/1/4/131455543/4448053.pdfIn PDF document text
    • http://wopew.rubyannemason.com/uploads/1/3/1/4/131438245/kepotatepujo.pdfIn PDF document text
    • https://site-1037890.mozfiles.com/files/1037890/92241875132.pdfIn PDF document text
    • https://site-1039886.mozfiles.com/files/1039886/67089429087.pdfIn PDF document text
    • https://site-1037230.mozfiles.com/files/1037230/17475638639.pdfIn PDF document text
    • https://site-1036879.mozfiles.com/files/1036879/mivowofosiwezorarita.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/cb1eff87-ba57-4687-a9d3-3ecd7f3580a1/saweda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd70c50d-7533-4611-926c-b099933827a7/64345745063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/463ca6e3-9b33-47df-9bd8-b2a4be502948/tepaxitub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779e5dee-9880-41a5-bf9b-5a0a2a9869c0/xajopixepexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f1c5d8-e8f5-4dd0-a078-3c00da922af3/repegumadiwaz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF1 5228 bytes
SHA-256: 6bf6e5b1d7fbcff0a86cd239f10d788fc08a837d7405d6d4d1ad0075b7935584
font_01_sfnt_off00007cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCE 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000855b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x855B 11044 bytes
SHA-256: 7a0716811611ddf9b3a5f34a4f156e100c4bba2c54475eb04aac05d15900eb9e

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