Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a499295d32ef411…

MALICIOUS

PDF

54.0 KB Created: 2020-10-27 20:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 562dbb01e61ccf21ecbc8b1c7e598263 SHA-1: e324d36fdbbc65e027387f28a7183cd6ffb5e350 SHA-256: 5a499295d32ef411acf40c51f1fbbde50b3965d77e462de85241a3a467b86c7b
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://ggtraff.ru/strik?keyword=the+necklace+short+story+summary'. The document body also contains this URL, suggesting an attempt to lure the user to a malicious site. The presence of multiple embedded URLs and the ML classifier flagging this PDF as malicious further support this assessment. No scripts were extracted, but the primary attack vector appears to be URL redirection.

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=the+necklace+short+story+summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f870b5b7f402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f8a5dee4ae27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f87520cdf7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5f8d35f07c344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_5f9341227fec4.pdfIn PDF document text
    • https://mexugagerow.weebly.com/uploads/1/3/4/4/134482965/aebb6e16baf4402.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/wirexanusir.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/01e9ed8f772.pdfIn PDF document text
    • https://zasigusedorel.weebly.com/uploads/1/3/4/3/134386673/6819356.pdfIn PDF document text
    • https://liwobolavus.weebly.com/uploads/1/3/4/1/134131542/nisitefote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5f91f49477838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f89662d34596.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/1/0434/0314/9479/files/xopefuxilefapojuzadelux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/9362/2429/files/sabukaxilur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9155/0104/files/download_game_street_racing_hd_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ebf141-04dc-4938-99ff-22d55a62ea73/review_herbalife_tea_concentrate_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b127726-0d8f-4df9-830a-bb73ffd0db5b/tavukupunozon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9552b090-e8b8-4041-9a6a-5e58ee890d58/2393536144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc0e4543-b385-4731-8dec-51b233030430/nifenapupuda.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/5427132098.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/tactics_for_listening_developing_tapescript.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/tamil_yearly_calendar_2019_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/91855144101.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/duties_of_company_auditor.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_off00009474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9474 5152 bytes
SHA-256: d6073b38d30823d7f205f77457b049df23614594ad832d183067f9ede559bc64
font_01_sfnt_off0000a5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5CA 11012 bytes
SHA-256: 521711021957fc13c7741bb00835463066d173a1ee798ffd9df0fd6957be6bd0