Malicious PDF — malware analysis report

Static analysis result for SHA-256 7290223f05e34625…

MALICIOUS

PDF

41.8 KB Created: 2020-10-10 01:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 187d92b39fd5732ced70019944a2ac73 SHA-1: f8b1fbec3dcbad28e20a667ab02b4ef2df9b3896 SHA-256: 7290223f05e346259de9a53955483b56fdcebfe78548bd4df4274f496f152692
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, disguised as a study guide. The ML classifier strongly indicated maliciousness, and the PDF structure includes a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of a phishing or malware distribution attempt.

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=6.6+meiosis+and+genetic+variation+study+guide In PDF document text
    • http://files.msacf.org/uploads/1/3/0/9/130968961/9063426.pdfIn PDF document text
    • http://luvedafud.shorthandnote.com/uploads/1/3/2/6/132681865/migagopefu_bafaxojevit_logesetulomu.pdfIn PDF document text
    • http://mobibuzev.suzannesesthetics.com/uploads/1/3/1/4/131406861/40247b6ba.pdfIn PDF document text
    • http://fifuz.sportmomsandmore.com/uploads/1/3/0/7/130740178/5adcdabf0f.pdfIn PDF document text
    • http://files.danamalart.com/uploads/1/3/1/6/131607331/vipinu-dafadekefopuxod.pdfIn PDF document text
    • https://site-1048476.mozfiles.com/files/1048476/vebuxirodoses.pdfIn PDF document text
    • https://site-1040977.mozfiles.com/files/1040977/xugamosajujibipofuje.pdfIn PDF document text
    • https://site-1040767.mozfiles.com/files/1040767/niroguvajini.pdfIn PDF document text
    • https://site-1040516.mozfiles.com/files/1040516/bitifutudit.pdfIn PDF document text
    • https://site-1037228.mozfiles.com/files/1037228/gizaguki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/muvore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0475/1586/1158/files/99391974424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9175/8756/files/vril_society_documents.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_off00006305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6305 5480 bytes
SHA-256: dce1515ea6cb0c18972d07568c430fa3e503b8b79d4f4df40692695ea04ea4a9
font_01_sfnt_off000075a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A4 10524 bytes
SHA-256: c2e1cec10d89679087259e29bbcde26584eb350884999446448f39bd85370dd1

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