Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38c09eae5c0e68c…

MALICIOUS

PDF

42.2 KB Created: 2020-11-05 05:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4cd5b3855db1d9903c43345508ec6fe1 SHA-1: 8b894bf87b2364362130700b568982ba81fd0b87 SHA-256: a38c09eae5c0e68c4a3320c07295f85804daefabdd74d66a075b583b61822982
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/wb?keyword=harry%20potter%20ibooks In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5f90e7d4146c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_5f94ec8f016ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f88b6977e16c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5f931a1cb6791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_5fa2e00a65dbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5f954c0f9fbcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_5f98ee35684cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390680/normal_5fa06e970288e.pdfIn PDF document text
    • https://wopuremob.weebly.com/uploads/1/3/2/6/132696580/4324019.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/somamere/rupigopebijofelegulexizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8360/2366/files/takudebubisitelobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9f77ec-2b9b-40cf-86f8-2403451d5996/60803462828.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_off0000671b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671B 5048 bytes
SHA-256: 2951f2ac16f2a1626d5d211287387c70c0314463d443541b53576a9aa0698296
font_01_sfnt_off00007855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7855 10648 bytes
SHA-256: d717fedba546db93ecf45f648ba0047e342d2cfb4c0b16a45ecce5233cf5a362

Open this report in the interactive analyzer, or submit your own file for analysis.