Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcbecb1e63599e2…

MALICIOUS

PDF

42.6 KB Created: 2020-10-30 21:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cc74cfce28aa944a149e1b84af291f1f SHA-1: 414163839aac9c89705852011209bbaeacd7307c SHA-256: afcbecb1e63599e26a1085c256e2e2d84be0f6638517dcdfd8def37bbdcdbe35
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDFs hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One URL, 'https://gettraff.ru/strik?keyword=nba+stream+discord', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure suggests a malicious document intended to lure users to malicious sites.

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://gettraff.ru/strik?keyword=nba+stream+discord In PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/befumupej.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/0a5879a5173.pdfIn PDF document text
    • https://moleresudiba.weebly.com/uploads/1/3/4/4/134447347/9151368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5f9607ce32413.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/2624916.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/3c3ef3d045c5a.pdfIn PDF document text
    • https://kizozejibudi.weebly.com/uploads/1/3/4/4/134460324/60339766f.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/afbd20b6-6d39-4d0b-bd5d-ce20424ce538/xakalumado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28634791-6ed9-45f8-ab15-b84e0f70ba79/95374802059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36dc34fa-da19-445a-91a7-f54f35572095/zejivofepiramobinu.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/jimizibabamaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb3fb4c-95cf-425c-8032-3d7dc9356323/jumuxaxabawejek.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_off000067ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67ED 5160 bytes
SHA-256: 78d2ac423bbbf29ebfc9fcf7950b95fb4db3378965a00929d8d589b42956fb5b
font_01_sfnt_off00007963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7963 11160 bytes
SHA-256: da67a0d13537250d7404acd12b2aca2dc7348801292b0b410813d920f59e35f2

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