Malicious PDF — malware analysis report

Static analysis result for SHA-256 f647c0352d30154b…

MALICIOUS

PDF

37.2 KB Created: 2020-11-07 08:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f6a04c24b8184921a8025d12cf2e4d7c SHA-1: d725788b8df93a5c4dde453c339f0a5704d08935 SHA-256: f647c0352d30154b604e767ed54b0463ec96f52a66a952d2d6d74161ec4ed854
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary links, https://trafffe.ru/aws?keyword=isle+du+bois, is flagged as suspicious. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure suggests an attempt to redirect users to potentially malicious or SEO-farmed content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?keyword=isle+du+bois PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f8810df97a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_5f9de37f3a29e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5f8fa95fed955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_5fa1a8e93f783.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdfIn PDF document text
    • https://gogajajar.files.wordpress.com/2020/11/48539197016.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/80535327798.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/37897023692.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.pdfIn PDF document text
    • https://pozajifu.files.wordpress.com/2020/11/anorganik_kimya_kitab.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/84429529503.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_off00005445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5445 4592 bytes
SHA-256: 302eee70ca50c78b140c337e4a805425eb88db5bf1f7e39446f7453e380363af
font_01_sfnt_off000063ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63EE 10896 bytes
SHA-256: 43bedc1395daa549e3b09736f36f2221c969ada09c3d538742e7696b463a3592