Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1412834511b495…

MALICIOUS

PDF

42.3 KB Created: 2020-10-17 00:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b8a0a17ace2f30a5061116bfbf9b7ef1 SHA-1: 095dea405b0a138da6c79eebae7f2239e7544e83 SHA-256: af1412834511b4959f861bc666f1e0ad6da17cff35576cde097236cdbb978c25
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors. The primary redirector URL, https://cctraff.ru/strik?keyword=b%25C3%25ADblia+de+estudo+heran%25C3%25A7a+reformada, is flagged as malicious. This indicates the document is likely part of a link farm designed to lure users to malicious sites, potentially for phishing or malware distribution.

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=b%25C3%25ADblia+de+estudo+heran%25C3%25A7a+reformada In PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/eac85730fb56439.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5058540.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/sapije.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/wovexofek.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/najudinaxakeja.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/vobetaxasifov.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/dixajalesinepup-mizolazo-vajoselo-nidilo.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/punadax-kazugokov.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/1336479.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/ruxiboxitozopakoton.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/falitaterajozesowus.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/zutabolom-neritevi-wapatokilab-nilelebatojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f870819b1b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f88aa4ec5da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f8a0637c95a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f875fab5caa2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a157f7-9369-4c69-800d-6614283e4b79/75667051456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a876e8-2c52-445a-a547-0112822546c2/5237110324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389189f7-1274-439c-bf48-253d1e12f26d/17083141087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d785d25-2877-4680-b775-238efa893684/71356926692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83b493b-a22c-4210-9cce-73f4e42ee33c/20226768585.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2969/9482/files/the_boxer_ukulele_chords_and_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8707/8587/files/zofuremuvugo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/existencialismo_e_humanismo_sartre.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_off000061bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BC 5572 bytes
SHA-256: 264c03c17d9e6774eb0f3c4b9f6c2c4fb62c6e710b858f4a7b02ad5493c85209
font_01_sfnt_off00007478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7478 12516 bytes
SHA-256: d29dbaf38d1d021a79d64be88f4b149e268f369769c4362bb969994eb7342c46

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