Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbcf8d2fa11a0aa…

MALICIOUS

PDF

54.4 KB Created: 2020-11-08 13:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 052d9f0d7d0b98ea69124c0287ac087d SHA-1: 9b406792e2903479519ff183ca2b2507743ed86b SHA-256: 7cbcf8d2fa11a0aa8648716a2b9fef49620e7a6c3530a172997f97f912fe1766
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous embedded URLs that redirect to potentially malicious content. The primary redirector URL identified is 'https://traffmen.ru/aws?keyword=amazing+adventures+of+kavalier+and+clay+movie', which is flagged as malicious. The document's structure and the high number of external links suggest an attempt to lure users to compromised or malicious websites, likely for phishing or malware distribution.

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://traffmen.ru/aws?keyword=amazing+adventures+of+kavalier+and+clay+movie In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f8f8a5ac9aac.pdfIn PDF document text
    • https://zugogulubituwo.weebly.com/uploads/1/3/4/2/134266111/sevowasabagemarimono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f9c1f9da9603.pdfIn PDF document text
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/4841169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5f9d9ebf131ab.pdfIn PDF document text
    • https://wadazujirala.weebly.com/uploads/1/3/4/5/134596454/gejikanusizogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_5fa5aa0282908.pdfIn PDF document text
    • https://sopudediliwaweg.weebly.com/uploads/1/3/4/5/134587721/af1d712.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/gokitetuj-tadidi-labililesile.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/e878d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fulebiw.files.wordpress.com/2020/11/49725108445.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/15017648682.pdfIn PDF document text
    • https://nunerov.files.wordpress.com/2020/11/lusifibaxetijabisuwetemev.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/74227085231.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_off0000959e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x959E 5604 bytes
SHA-256: 2d281faf481646736c27fc738e96f897bd4bf7c7ae01422f4d5fd96b368a8465
font_01_sfnt_off0000a8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B3 10492 bytes
SHA-256: fb0eadabff172830936e3ddc11c6f35ddfe2032b23b2d1580c23dba17382dd96

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