Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac01dbef05d7ada3…

MALICIOUS

PDF

33.3 KB Created: 2020-10-05 10:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ba18dce7e52c0e9e7aeb7e50f8608e30 SHA-1: 5a4d2783f3f91d7a45ef578ff65ce2f597cce5a2 SHA-256: ac01dbef05d7ada3890fd3657213c34db6aa325fae777ba626c223f30bce231b
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?keyword=the+grammar+book+3rd+edition'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm designed to obscure the final malicious destination.

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=the+grammar+book+3rd+edition In PDF document text
    • https://site-1038575.mozfiles.com/files/1038575/lavakixewerozojopu.pdfIn PDF document text
    • https://site-1037842.mozfiles.com/files/1037842/vivawodixesinipuzozewa.pdfIn PDF document text
    • https://site-1043259.mozfiles.com/files/1043259/sidonusopevujamukupugoxep.pdfIn PDF document text
    • https://site-1038504.mozfiles.com/files/1038504/lopitamiropemuforutep.pdfIn PDF document text
    • http://files.boyzaudio.com/uploads/1/3/2/7/132740905/kalonitinejadi_laxexujafoj.pdfIn PDF document text
    • http://files.jerrycancompany.com/uploads/1/3/2/3/132302978/243ea979533281.pdfIn PDF document text
    • http://xovaz.rippintimber.com/uploads/1/3/0/8/130873851/1304801.pdfIn PDF document text
    • http://files.jae-k.com/uploads/1/3/1/4/131453969/3423115.pdfIn PDF document text
    • https://site-1038345.mozfiles.com/files/1038345/towunenavujubopakiw.pdfIn PDF document text
    • https://site-1038768.mozfiles.com/files/1038768/75665289556.pdfIn PDF document text
    • https://site-1039834.mozfiles.com/files/1039834/42841544517.pdfIn PDF document text
    • https://site-1036807.mozfiles.com/files/1036807/2368748656.pdfIn PDF document text
    • https://site-1039506.mozfiles.com/files/1039506/58339189302.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/384bae32-c344-4d66-bb37-bb96cff906c2/47038944092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28cf6563-54ea-41f2-bb27-8b38f5b7b0cc/27303521593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3984f8-6178-46b5-9db2-e8f6fabaa95e/sunebuwasefalazumoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4217635-5cc6-41f4-85a1-c5eef9960b2f/betezasusakomobi.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_off0000458f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x458F 5344 bytes
SHA-256: c146b6a6adaada4d4e153604385a464edeeed1281f1055d741d5c1d099301aaa
font_01_sfnt_off0000578f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x578F 9728 bytes
SHA-256: 051859cc6820feb97241e48ddac13f812a6953fe27d109d9f7d20c0795804ea1

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