Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fb95f4134d0a6f…

MALICIOUS

PDF

47.1 KB Created: 2020-10-01 05:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 52cc2fa6f1154fedb6c522ed1980383a SHA-1: 7b9f6bd0738b0c0463c419ce76914cda3ece884d SHA-256: d8fb95f4134d0a6f079a834b32f18f4b171a0257383171fb091a89ba2e8e05c9
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, indicating it functions as a link farm. One of the embedded URLs, 'https://gettraff.ru/strik?keyword=a+moving+child+is+a+learning+child+free+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to direct users to potentially harmful or SEO-manipulated content.

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=a+moving+child+is+a+learning+child+free+pdf In PDF document text
    • http://files.drvitkohealth.com/uploads/1/3/1/0/131069934/935656.pdfIn PDF document text
    • http://files.marcjrobinson.com/uploads/1/3/0/7/130775432/a98380c5.pdfIn PDF document text
    • http://setez.molbiosystems.com/uploads/1/3/0/7/130776483/setuvomux-xuxenojiviwor-mulezamufo-devawelo.pdfIn PDF document text
    • http://files.himalayandiversityproject.org/uploads/1/3/0/8/130873992/3fc095be538f370.pdfIn PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/88359774601.pdfIn PDF document text
    • https://site-1036917.mozfiles.com/files/1036917/wibox.pdfIn PDF document text
    • https://site-1039275.mozfiles.com/files/1039275/funekoraxa.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/wanovep.pdfIn PDF document text
    • http://files.sjnelsonpsychologistcardiff.com/uploads/1/3/0/8/130874253/ee7b308a02526f2.pdfIn PDF document text
    • http://files.haymakerlaw.com/uploads/1/3/1/4/131407227/6356713.pdfIn PDF document text
    • http://files.a1a-live.com/uploads/1/3/0/7/130776647/4767070.pdfIn PDF document text
    • http://files.tapirday.org/uploads/1/3/0/9/130969718/5364561.pdfIn PDF document text
    • http://watok.artisanhandfood.com/uploads/1/3/2/7/132712336/jetuliwamebu_jevotojig_naxuposa.pdfIn PDF document text
    • http://desupigu.retroca.com/uploads/1/3/0/7/130739892/7854976.pdfIn PDF document text
    • http://files.upcreekcreations.com/uploads/1/3/0/8/130874520/2d83ee4c707bc.pdfIn PDF document text
    • http://files.jaxcpaa.com/uploads/1/3/1/6/131636736/4114012a86.pdfIn PDF document text
    • http://titetudiw.fureverfashionbyaprilllc.com/uploads/1/3/0/7/130739173/ribaso.pdfIn PDF document text
    • http://tugude.derechhatorah.org/uploads/1/3/1/3/131398252/c409d162ac98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000078ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78ED 5620 bytes
SHA-256: e40fb3e3b3afa2748b2583c9f6eceddd76b2704dab08db22e1bb320a6f194024
font_01_sfnt_off00008bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BED 10440 bytes
SHA-256: 6ae0a2da7bcac7094a94228b63febe6a5f7c126f621c30d37e70a7a7293fa999

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