Malicious PDF — malware analysis report

Static analysis result for SHA-256 992defde0937de4e…

MALICIOUS

PDF

43.2 KB Created: 2020-11-02 19:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 527a1d345a1f610b26681a8537db7f25 SHA-1: ecfb0c8045c6e6c7ba16348d95bdb69b44489603 SHA-256: 992defde0937de4ea10ca82b728cf6241c55565afe556dca55ae5e653327b32b
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 external links, many pointing to disposable hosting services and a known malicious redirector. The document body contains obfuscated text and URLs, suggesting an attempt to disguise its true purpose. The primary function appears to be SEO manipulation or redirecting users to potentially harmful content, rather than delivering a direct payload.

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=mts+assay+analysis In PDF document text
    • https://gowiwoniba.weebly.com/uploads/1/3/1/8/131857243/2943861.pdfIn PDF document text
    • https://toleminifuf.weebly.com/uploads/1/3/4/0/134017029/famonomif_tinud.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/xupabozividefirupax.pdfIn PDF document text
    • https://kenumobubedu.weebly.com/uploads/1/3/4/3/134370592/zupudipupokugupafax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f91a64eee7bd.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/xolotogoraput.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/1196878.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ef148f-bdb6-4569-b689-39497079c4a4/lumesagugikid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d25237-ff00-4701-977f-438a880b61ae/45311092529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/408176a1-50a0-47e8-84f1-7f00abab0d17/fofoliwozitemojozezolasu.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_off000068be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BE 4692 bytes
SHA-256: 7e1cc1ab19a0933d52603843f2bd7f3fca5d9d769ee2ccb4233bc57f0ee64010
font_01_sfnt_off000078d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78D7 12592 bytes
SHA-256: 0faa7b333f4943402321aa2a9f78bce8b4bdf95697c8ec2504223fad6b6a4f97

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