Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb76f2031dd8099…

MALICIOUS

PDF

52.4 KB Created: 2020-10-27 07:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f9e0495b6a3411680b7657378df0ca4b SHA-1: 74f6597d6f0cf2dd7a37c3f8af4f938537ba632b SHA-256: ebb76f2031dd8099295a4687aef91795ebf794790a78f9d59e3e5338a3d8a51a
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirectors, indicating a link farm or SEO spam operation. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the presence of numerous external links suggests an attempt to drive traffic to potentially malicious sites, possibly for phishing or malware distribution.

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://ttraff.link/123?keyword=kiss+me+guitar+chords+no+capo In PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/36c49.pdfIn PDF document text
    • https://kiteginizi.weebly.com/uploads/1/3/1/8/131871518/zabelifipa-zexij.pdfIn PDF document text
    • https://joxenawofin.weebly.com/uploads/1/3/4/3/134342561/434585f2649.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/pesasuzarapoga-redegom-pidojitu.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/lekavebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f884827f37fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5f8ea4c65ba3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5f89282e4858c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ab8d8881-23c8-4613-b6bd-c118c0422a62/69213063376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465038b3-5f37-4999-a0e7-06c132d7fccd/mobijo.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/98925543280.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/nuxelun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c39d25-d75b-4b65-b494-b0071ca4ff97/74406719068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8696c4-d3e8-4982-8d8c-f55d55b75ad5/36093315763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a0a654-0025-4e53-ae64-2c73403321e4/blitzer_algebra_and_trigonometry_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9864d83e-a772-4962-b0f8-a491f454a319/zivalotofelibigetenudub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec56b39-0e31-4561-9b0a-b747dbfb096e/14992202163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/362bb963-ed36-4e32-a602-998b23691197/58192530862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d95515ac-159b-47f0-be4a-0d8b9aba3f87/lubavakamiziwizumese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84993dc1-2874-4ed8-b896-2e4ad40bfe99/68067991458.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_off00007528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7528 5308 bytes
SHA-256: de1f83c7e19201e6dfe96f17d47aa5bb77cc3c39e85861008bf32af93d810151
font_01_sfnt_off00008701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8701 15016 bytes
SHA-256: f905ccf14a5fc09374ffa5249ce185c5a70a9bd8bf47b8389847dcc8d1e44875
font_02_sfnt_off0000b648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB648 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333