Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b7ab74e81ef4fc…

MALICIOUS

PDF

40.8 KB Created: 2020-11-03 16:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3e06b1c2deb31cc80219b07d00083d2f SHA-1: 31e899f4e5a5c0656024798d2e74e97f3f7ba87a SHA-256: b3b7ab74e81ef4fcb2439012a8cacfc5c0323dfdfdc24fa1e146f5a81476287c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is identified as malicious due to its extensive use of link farms and redirection to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that points to a malicious redirector, indicating an attempt to lead the user to a compromised site. The presence of numerous embedded links, many pointing to disposable hosting or link farms, further supports the malicious intent of this document.

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/strik?keyword=positive+consequences+examples+in+a+classroom In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f8a446e6f75e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f8a2bfe0697d.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/1a27643b41869.pdfIn PDF document text
    • https://rasagarus.weebly.com/uploads/1/3/4/4/134452949/a0a23.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/wurojija.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/764415.pdfIn PDF document text
    • https://zutafemaz.weebly.com/uploads/1/3/4/4/134478566/mirop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8baba24b8b2.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/fezenur/operation_ember_rise_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/747ee019-749e-41e9-b35f-3f1e6e29ede4/16920284099.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/47541228750.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/lomasigenatalekos.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_off0000613c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613C 5336 bytes
SHA-256: 7adbe1e6e059edb50c8c1d8a75b1d17b963481163c6fefb5eef382d91f5d34e9
font_01_sfnt_off00007357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7357 10028 bytes
SHA-256: 419df4edcd892a18a5dbb9531a206240fd5b149b24b8e6061a164ff63031c399

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