Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefcc23a9ebd4bfa…

MALICIOUS

PDF

43.7 KB Created: 2020-07-10 02:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 761465359a1a852c252e45d96aa7b9ab SHA-1: 5065c3251f1b4de57c8edaa28f8c4d2856ded00f SHA-256: cefcc23a9ebd4bfa92202bd56182418b25db072e4296c551cc6d610b40dc5eb1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm designed to manipulate search engine results or distribute malicious content. One prominent link redirects to 'https://ttraff.ru/wb?keyword=historia%20segunda%20guerra%20mundial%20pdf', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Historia segunda guerra mundial pdf', suggesting a lure to entice users to click the malicious links.

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/wb?keyword=historia%20segunda%20guerra%20mundial%20pdf In PDF document text
    • http://files.worldofspanishllc.com/uploads/1/3/2/6/132682134/68d0380d.pdfIn PDF document text
    • http://files.westsurreytennisclub.com/uploads/1/3/2/8/132815207/vopupavowoxusuf.pdfIn PDF document text
    • http://files.dogtagsprogram.org/uploads/1/3/2/7/132741045/libawixu.pdfIn PDF document text
    • http://files.doritbar-on.com/uploads/1/3/1/0/131070612/pifofegedidulo.pdfIn PDF document text
    • http://files.martialartsmarin.com/uploads/1/3/1/6/131606295/momiratu.pdfIn PDF document text
    • http://files.jonathandogaming.com/uploads/1/3/2/7/132741189/tekebel.pdfIn PDF document text
    • http://files.scnavhda.org/uploads/1/3/2/8/132814182/7446357.pdfIn PDF document text
    • http://files.brouleepublicschool.com/uploads/1/3/2/3/132302924/xesonalejilili_kegap.pdfIn PDF document text
    • http://files.trebor-ts.com/uploads/1/3/1/8/131871690/4fa93.pdfIn PDF document text
    • http://files.suzanneboutiquecobham.com/uploads/1/3/1/4/131452806/3656518.pdfIn PDF document text
    • http://files.thesunnymom.com/uploads/1/3/1/8/131871494/lenojuti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://likulorasix.files.wordpress.com/2020/07/69684017768.pdfIn PDF document text
    • https://vafosanego.files.wordpress.com/2020/06/vawemi.pdfIn PDF document text
    • https://fagaludilide.files.wordpress.com/2020/07/zimunipeko.pdfIn PDF document text
    • https://kinokazodisa.files.wordpress.com/2020/07/24405302547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puxatofutedixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.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_off00006bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC1 5204 bytes
SHA-256: 980c0c422a60aad49c9ce76895137ea1cf9622b33b70dc81530835b7858a98b7
font_01_sfnt_off00007d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D53 10588 bytes
SHA-256: 4a4eb8c44368147623fe9c31c3b7a52567c57d5cb70d327df3bcd92039d590bd

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