Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc23cd6f7c0d232d…

MALICIOUS

PDF

32.8 KB Created: 2020-11-03 23:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1fac2f87f3b6d0df34f9fcc58af71178 SHA-1: 9f18b8fcde2520ec46aa6dc1910e8ed633482a2b SHA-256: fc23cd6f7c0d232d9472942baba8ea73c177b7510fc0704b213c0aa5299456d7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting services and a known malicious redirector. The primary purpose appears to be to lure users into clicking these links, potentially leading them to malicious websites or further infection vectors. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm designed for malicious redirection.

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.ru/123?keyword=us+army+jrotc+cadet+creed In PDF document text
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/zivininupagoxe_wojek_mefudujove_kuvapokofuvikur.pdfIn PDF document text
    • https://zafitageleg.weebly.com/uploads/1/3/4/4/134489703/c4725bb0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_5f9cde1b6c471.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/baravijubegavuv.pdfIn PDF document text
    • https://sakifawabepufa.weebly.com/uploads/1/3/4/4/134466371/9006a88136.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/cb0963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_5f9c5dde79c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_5f9e7d3607fec.pdfIn PDF document text
    • https://nadosivilir.weebly.com/uploads/1/3/4/3/134316305/revajif.pdfIn PDF document text
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/jobusikaverowuj_jopajomulovevi_sosegimusurepin_jukumef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f882b8251c24.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/baxegezivumi/nahco3__hc2h3o2_reaction_type.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_off000044ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44AB 5224 bytes
SHA-256: 483b60599e76c026110a338b0a2c1d4a7113b314c456f57640ec6e07797f3622
font_01_sfnt_off00005662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5662 9412 bytes
SHA-256: b2ff1fb14e8a437be1a11b738730c33f4f9b50878ad3f001887c231b89a9ff90

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