Malicious PDF — malware analysis report

Static analysis result for SHA-256 455a7d149bbc7b47…

MALICIOUS

PDF

35.5 KB Created: 2020-10-09 20:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ce33786dba8085144bc03c072c9c5d4e SHA-1: 8d541e4cbd961582c9167a50505f61dc65a2c5d1 SHA-256: 455a7d149bbc7b47bf68bf653c590e88eb2683862be78d3319c058cf6d577609
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a primary link pointing to a known malicious redirector. The document body text, though partially corrupted, includes the target search query and the malicious URL, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a redirection-based attack pattern.

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://ggtraff.ru/strik?keyword=cleveland+plain+dealer+obituaries In PDF document text
    • https://site-1039533.mozfiles.com/files/1039533/46328380409.pdfIn PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/niluterezuneg.pdfIn PDF document text
    • https://site-1040141.mozfiles.com/files/1040141/99521916677.pdfIn PDF document text
    • https://site-1041587.mozfiles.com/files/1041587/71574037890.pdfIn PDF document text
    • http://wufoviwu.musillosales.com/uploads/1/3/0/7/130776031/3e8839.pdfIn PDF document text
    • http://latikit.tylerhousecleaning.com/uploads/1/3/2/7/132741154/ranelikasosogomes.pdfIn PDF document text
    • http://wunelig.srmsmusic.com/uploads/1/3/1/4/131438759/8497271.pdfIn PDF document text
    • https://site-1039875.mozfiles.com/files/1039875/xupojikafujolabojeb.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/tezod.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/1/0482/1106/7034/files/malujavalijor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4944/6307/files/goodys_department_store_macclenny_fl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/great_west_lifeco_conference_call.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6353/2959/files/24699913171.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_off00004dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DC3 5056 bytes
SHA-256: 3a349a2e79b674b08de0c887ab526a63ed624dcd4a82aa75b1392948f2aa2483
font_01_sfnt_off00005ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF9 10084 bytes
SHA-256: 2a79ca914f1bdae7408135be66460de785027086b0c42c5933c1429f42984cfa

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