Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84e2e70e3e8e7a4…

MALICIOUS

PDF

46.5 KB Created: 2020-11-02 20:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: de666b6b3793427c977a67fc2bc37648 SHA-1: 3fb07ccf089630a14844bc5964e12ea7d37de17b SHA-256: d84e2e70e3e8e7a4b70177ec78981448c016331495687b759c7d994057b08bb0
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 document contains a large number of embedded links, many of which point to disposable hosting services and redirector domains. The primary purpose appears to be SEO spam or directing users to malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics. The ML classifier also strongly flagged this sample as malicious.

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://ggtraff.ru/aws?keyword=physical+science+pdf+book In PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/kolifinakuwe_vizitewinagaja_sesidugonav.pdfIn PDF document text
    • https://josafobuwevaj.weebly.com/uploads/1/3/4/4/134464642/kuzobem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5f949c69dd18c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f8925f26991a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_5f94ae788a7ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f90001dcbc63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401985/normal_5f9620dd93127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_5f9bfedacde87.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/6443216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f8dffcb522d6.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/zarigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f87f8be2aebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f9145b0e7050.pdfIn PDF document text
    • https://pudozewo.weebly.com/uploads/1/3/4/3/134311846/rameniwujufuxup.pdfIn PDF document text
    • https://lizotolagodega.weebly.com/uploads/1/3/4/4/134495854/4416037.pdfIn PDF document text
    • https://xexasatokotubeg.weebly.com/uploads/1/3/4/3/134354060/bapedekujimimujezexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000750c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x750C 5452 bytes
SHA-256: 1c50fc561bc8a0bbde07f1c2e7f8db62fc2b8cbbfe3141dc39b68b4eace2f7e0
font_01_sfnt_off000087a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A2 11204 bytes
SHA-256: e1bb0fae9234d231a287cacdc0b447f9349094e9d21f6285ff66b9f3905360b2

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