Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f95d6a0880da9f…

MALICIOUS

PDF

39.7 KB Created: 2020-10-01 19:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a58d5d4fcfba50d543606fbdedf74cdd SHA-1: 5dbaf655f2fe5c36dcb4d6105699d27ecfd3b7ce SHA-256: 88f95d6a0880da9fbd00e171d1fa3a0a9e268393a5922d0c108c6fa333ce2756
184 Risk Score

Malware Insights

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

This PDF document functions as a link farm, presenting itself as educational material ('inorganic chemistry short notes for neet pdf') to entice users to click on embedded URLs. The primary URL, https://cctraff.ru/strik?keyword=inorganic+chemistry+short+notes+for+neet+pdf, is identified as a malicious redirector, indicating a likely attempt to lead users to malicious content or phishing sites. The document's structure and numerous external links suggest a campaign to distribute malware or facilitate phishing attacks.

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/strik?keyword=inorganic+chemistry+short+notes+for+neet+pdf In PDF document text
    • https://site-1037166.mozfiles.com/files/1037166/95999878525.pdfIn PDF document text
    • https://site-1037138.mozfiles.com/files/1037138/80865530054.pdfIn PDF document text
    • https://site-1037835.mozfiles.com/files/1037835/menodugaxafino.pdfIn PDF document text
    • https://site-1037192.mozfiles.com/files/1037192/febakiza.pdfIn PDF document text
    • http://ralewim.johnlockheating.com/uploads/1/3/1/6/131637140/wafisa-sezixa-gifixed.pdfIn PDF document text
    • http://tigulev.hiemstragardens.com/uploads/1/3/1/6/131637839/41848a6a1ac.pdfIn PDF document text
    • http://files.taleinferno.com/uploads/1/3/0/8/130874189/fokonufesiloga-tikelusajo.pdfIn PDF document text
    • http://files.marcoliva.com/uploads/1/3/1/3/131398336/548e801.pdfIn PDF document text
    • http://files.customironideas.com/uploads/1/3/0/9/130969724/jobamezifovarege.pdfIn PDF document text
    • http://files.mydesignsandremodeling.com/uploads/1/3/1/4/131453623/5719179.pdfIn PDF document text
    • http://sebal.jaynepatrickart.com/uploads/1/3/1/3/131381464/6e47c0f317d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC8 5576 bytes
SHA-256: c70fbcf1ee01c4309e5c765826d028c0e949a0cc2f4f0f8295966896a1b936a1
font_01_sfnt_off00006e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9D 10324 bytes
SHA-256: 43bcd0a2040f88a18ee99c4c7267d9f703173c82d4158155ba90a4d5053f460f

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