Malicious PDF — malware analysis report

Static analysis result for SHA-256 5637d71edb664ef4…

MALICIOUS

PDF

36.6 KB Created: 2020-10-30 09:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ce4948e580be15258438059adc2d1f21 SHA-1: 4c143cd60145370d658bcf51496da72c1af4197e SHA-256: 5637d71edb664ef4f80adef05cace24236d876ac8f8972e0dde9064424a611fb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious due to its extensive use of link farms, with numerous embedded URLs pointing to external PDF documents. One of the primary URLs, 'https://gettraff.ru/123?keyword=blues+run+the+game+nick+drake+tab', is flagged as a known malicious redirector. The document body appears to be obfuscated or corrupted, but the presence of these link farms strongly suggests an SEO poisoning or redirection attack. No scripts were extracted, but the overall structure and URL analysis indicate a malicious intent to redirect users or manipulate search results.

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/123?keyword=blues+run+the+game+nick+drake+tab In PDF document text
    • https://sidunaxegizu.weebly.com/uploads/1/3/0/7/130776644/basumoxitevale.pdfIn PDF document text
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/gijotepifuv_bedajowudal_jerupezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404964/normal_5f9806da776c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_5f91bc5b0fd9d.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/719650c.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/e17cb10e40b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_5f9b6d174989c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0889/9250/files/nofabubufirubekuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c912bd0-0fc7-46e3-9881-7ffb18699fa3/kupimitexokujapewujifab.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/important_questions_for_b._com_1st_year_financial_accounting.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5021 5604 bytes
SHA-256: e46619b81c51cb64baf75ac6d9bfd8ac143811a4e4c0817c5cb014c3b96168a7
font_01_sfnt_off00006303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6303 10280 bytes
SHA-256: f6f5d0b7b117c52cf52fc5c30fbd66288afa421a65c7858f901595d1fb29eabd

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