Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff97957cb5e8529…

MALICIOUS

PDF

49.3 KB Created: 2020-10-28 11:18:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 80ca10953871481b91918e749678b354 SHA-1: 9f6dfed25cb7bc258f8b4315a142c0af2debbba8 SHA-256: cff97957cb5e852956c4ada05282787ca28c0e63b32722ab7c6c137fed6decda
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically impersonating Yahoo to lure users with the promise of free movies. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests a phishing or SEO poisoning campaign. The primary malicious URL identified is https://gettraff.ru/123?keyword=best+free+movies+online+website+yahoo+answers, which likely leads to a credential phishing page.

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/fezidibufekis-ravakubaxekezo-pisomewafav-ketilelojekip.pdf.
  • 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/123?keyword=best+free+movies+online+website+yahoo+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f8cafa446677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f979cc6dc259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f8d55c811170.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/fezidibufekis-ravakubaxekezo-pisomewafav-ketilelojekip.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/1ee2994.pdfIn PDF document text
    • https://mobuzuwatajol.weebly.com/uploads/1/3/4/3/134310732/4568452.pdfIn PDF document text
    • https://visuzajekug.weebly.com/uploads/1/3/4/3/134305902/1564337.pdfIn PDF document text
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/wazofelijulotizibate.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/zaluv.pdfIn PDF document text
    • https://riramiseba.weebly.com/uploads/1/3/4/3/134369938/29854.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/jamokaroxoj/3150681861.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/switching_and_finite_automata_theory_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/exam_az-_203.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/arabic_quran_in_english_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/proceso_de_absorcion_de_nutrientes_en_las_plantas.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/kutelezupiliremug.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/alexandrov_topology.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/55983814743.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0719/5311/files/77971902544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2730/0036/files/bipaxipe.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_off0000814b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x814B 5448 bytes
SHA-256: 9d4753407d85285269c88f85ec2e4c48913c0bf4c47ef34c7d9ba893880da0f3
font_01_sfnt_off000093bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93BC 10532 bytes
SHA-256: 13ef67449d444409770a75e9dbb6f2149421cb7654032514d032eb93579b84f5

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