Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1869fcef2dd890…

MALICIOUS

PDF

62.9 KB Created: 2020-10-07 10:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e045e82dcb9d4f9c9317f1120ecab650 SHA-1: 2406ad5220c2f3d718193649e572adce2ed53037 SHA-256: 8e1869fcef2dd89079b001dcd0888eea36d588bbd3f5832b911b4e5530f08f4f
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors. The primary URL, 'https://ggtraff.ru/strik?keyword=geometry+worksheet+angle+and+segment+addition+postulate', is flagged as malicious. The document body, though heavily obfuscated, contains this same URL, suggesting the document's purpose is to redirect users to malicious infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=geometry+worksheet+angle+and+segment+addition+postulate In PDF document text
    • https://site-1036691.mozfiles.com/files/1036691/27121280600.pdfIn PDF document text
    • https://site-1037187.mozfiles.com/files/1037187/43382189321.pdfIn PDF document text
    • https://site-1040669.mozfiles.com/files/1040669/7714628464.pdfIn PDF document text
    • http://files.pureheartbody.com/uploads/1/3/1/4/131437018/999772aa1c5.pdfIn PDF document text
    • http://files.designsbymeghan.net/uploads/1/3/1/3/131383813/184286d7bf2.pdfIn PDF document text
    • http://xuxakuna.visaliaobgyn.org/uploads/1/3/0/7/130775683/ca3ef53f7.pdfIn PDF document text
    • http://mivepazo.verseapack.com/uploads/1/3/0/8/130814591/e80dc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/camp_oak_hill_in_oxford_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0676b23-018a-4000-b080-6c7c04a5cf5d/58312029248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78345f92-8190-4d27-a329-6710cfc99bd4/25219192899.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_off0000a566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA566 2828 bytes
SHA-256: 3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec
font_01_sfnt_off0000af61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF61 5664 bytes
SHA-256: 0b163bebe25252f13135372505d8c19b096de70df875ea7fb6c23bd311bf34e9
font_02_sfnt_off0000c29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 12852 bytes
SHA-256: 6e302521d0ab225541247f781b9831d1e1908b4aaffa1a5bcc07dcaee28e57bc

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