Malicious PDF — malware analysis report

Static analysis result for SHA-256 525415e486b55605…

MALICIOUS

PDF

38.7 KB Created: 2020-11-05 17:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c194749416c1556d970a7c74f4066db7 SHA-1: bef4a1dabf6f9f6ab7663c27b07b91940373ab5c SHA-256: 525415e486b55605d0e73c9e1c8cffcdd64065714763292618a43ae6ace3e103
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://traffine.ru/123?keyword=i+was+sober+for+an+hour+lyrics'. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the URL, likely intended to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://traffine.ru/123?keyword=i+was+sober+for+an+hour+lyrics In PDF document text
    • https://xogaketur.weebly.com/uploads/1/3/4/5/134593565/jopova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f8e8f737610a.pdfIn PDF document text
    • https://xerirexu.weebly.com/uploads/1/3/4/5/134592073/256934.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/dfb0f5.pdfIn PDF document text
    • https://fumumakol.weebly.com/uploads/1/3/4/0/134017799/9695427.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/dc5fc.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/dd229e62.pdfIn PDF document text
    • https://maxojemuv.weebly.com/uploads/1/3/4/2/134266220/zorupemu_zusujodute_zipijufizowoj_tesedipiropawa.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/riwax.pdfIn PDF document text
    • https://luzodogapop.weebly.com/uploads/1/3/4/2/134265842/9330737.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/kagedatabujo/saunders_nclex_pn_7th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/93069205568.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/worigipenujuk.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/adsorpsi_langmuir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FC1 5240 bytes
SHA-256: e5c086fe6842567b040286225d060a8c1b218012790b7b2231deddb2bd1c6152
font_01_sfnt_off000061a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A1 1892 bytes
SHA-256: 1fc12a375bcc3be3bb541ba0d2e75a9deb76d5cd30a42549199b3ff9798c8b1e
font_02_sfnt_off00006ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC1 10220 bytes
SHA-256: d3067b43dd935928f3be0ceb7778a99d8b84296ad929bf38d31aea4f5222a7f8

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