Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40ee88affea5d0f…

MALICIOUS

PDF

67.0 KB Created: 2020-10-02 11:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c83fe136317e0862c23159ea85c83485 SHA-1: e019d3eefdd94ddd03c6524a2c6e7bdc811e1ef8 SHA-256: b40ee88affea5d0f06786b24b53757e653e40d2e0c8afdc831cb309d503192ed
124 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains multiple embedded links pointing to known malicious redirector infrastructure. The primary malicious URL identified is 'https://gettraff.ru/strik?keyword=prova+fundamentos+e+teoria+organizacional+uniasselvi+2019'. The document's structure suggests it functions as a link farm on disposable hosting, aiming to funnel users towards harmful sites.

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://gettraff.ru/strik?keyword=prova+fundamentos+e+teoria+organizacional+uniasselvi+2019 In PDF document text
    • https://site-1039801.mozfiles.com/files/1039801/jexemawipupixaxi.pdfIn PDF document text
    • https://site-1037176.mozfiles.com/files/1037176/2289520500.pdfIn PDF document text
    • https://site-1040082.mozfiles.com/files/1040082/suxabowefirodu.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/kalekisadabedufed.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/gufanodemozogisevodom.pdfIn PDF document text
    • https://site-1038427.mozfiles.com/files/1038427/33104380921.pdfIn PDF document text
    • https://site-1040203.mozfiles.com/files/1040203/poroniguzajesef.pdfIn PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/26016330035.pdfIn PDF document text
    • https://site-1037907.mozfiles.com/files/1037907/10420865791.pdfIn PDF document text
    • https://site-1038898.mozfiles.com/files/1038898/razexanadusogeb.pdfIn PDF document text
    • http://gazezeb.liveandwincoaching.net/uploads/1/3/1/1/131164319/3f0cca96.pdfIn PDF document text
    • http://files.choosembd.com/uploads/1/3/0/7/130739379/delexemewarosasivux.pdfIn PDF document text
    • http://files.lovehealthyme.com/uploads/1/3/1/4/131408899/0baefd027162a.pdfIn PDF document text
    • http://sivujav.mayrosehurst.org/uploads/1/3/1/6/131637136/wejulafuvasulo.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/126a5f80-dee3-4930-991e-3dade8f78872/24019143850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4122863-6774-4d31-847e-6fdf4e8fcdbb/mefafovuxulovudowikolux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b805308c-280a-4134-ad25-b4f24f039a80/45951283294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2bbb0a-6fb5-4e1e-82dd-4b0f2421852d/fekozatijodi.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_off0000bfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD6 5932 bytes
SHA-256: a90fedf0d91f8718a091f87b1e2227b641b2b6d2db814c20f94a62a0296c80b3
font_01_sfnt_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 13184 bytes
SHA-256: 29d9ab6e31d54bcbede079e2864cd17967f4f3ef9b1e72056514aac5154529ad

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