Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4116473b54e053a…

MALICIOUS

PDF

81.7 KB Created: 2021-03-04 20:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7acabb2683bd40a243079995552da6bf SHA-1: d89995ea406c062544d91367abb626357fd7745d SHA-256: f4116473b54e053aa10ab47b1a895f4de0f65ba2aceb78bc2b3003b0425f0192
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The document body, though heavily obfuscated, contains text related to a game quest glitch, likely intended to trick users into clicking the malicious links. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs points towards a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/123?utm_term=witcher+3+the+last+wish+quest+glitch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462339/normal_6023edfbcfd0e.pdfIn PDF document text
    • https://cdn.sqhk.co/tudenireso/hfigrgf/misilikimulewupisifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_6013bde94dbed.pdfIn PDF document text
    • https://gigazubexu.weebly.com/uploads/1/3/4/6/134613152/ead9f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485161/normal_5fde3a352315a.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/736328336.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/dIiafhj/93577005211.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/sea_of_monsters_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_6011ec2c182bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_60137638b5e1f.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/57245704989.pdfIn PDF document text
    • https://vazexisosumufil.weebly.com/uploads/1/3/4/4/134465451/ruponekujumisebiba.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/17137703632.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/jejirapavedaseno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_602da4e508e69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wemazun/hydraulic_oil_68_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/ableton_9_plugins.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/demetapivolujiwugenarago.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_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 5456 bytes
SHA-256: 7762c21a564cc606d506efd82d922c6e6ec3db367f0e14f76e247531d42708da
font_01_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 10692 bytes
SHA-256: de170d16cae059d84460e3e5293babd877452d8308c241aa13c039ff6558a9ff

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