Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c65bc350d33dd5…

MALICIOUS

PDF

42.3 KB Created: 2020-10-30 05:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 11430c696629152784f4383c0260394a SHA-1: ba776da3264b16c1df6352b560c0603aa4b93257 SHA-256: 38c65bc350d33dd561efc63f951535becfdb5492c5db27daaae0b4e53915acba
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 link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded URL https://ttraff.com/123?keyword=phonak+hearing+aid+parts+uk is a primary indicator of this malicious redirection. The document body, though heavily obfuscated, contains references to this URL and other links, suggesting a phishing or scam attempt.

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://ttraff.com/123?keyword=phonak+hearing+aid+parts+uk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f8c6fcb8c83e.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/6515982.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/2046507.pdfIn PDF document text
    • https://todijaxazifaro.weebly.com/uploads/1/3/4/3/134342800/nenedimomife-sojezez.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/tefafap.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/duxudos-wakaman.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5f8a14566b6bf.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/divexikav/the_birth_of_korean_cool.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/33080073780.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/budget_worksheet_for_high_school_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67889e88-b1cb-442a-b1d0-239e4720eb25/9050773778.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_off00006502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6502 5256 bytes
SHA-256: 8ced8fd614fe55ed8fd0c1ee5b8c4f490f83a63f514fd2e1c1967aeb066c11c4
font_01_sfnt_off000076dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76DC 11212 bytes
SHA-256: 718bcb4a898e648bb16fb649949622e8128c00a26640324660f88cf55e35c3d3

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