Malicious PDF — malware analysis report

Static analysis result for SHA-256 8979167aadaac595…

MALICIOUS

PDF

41.4 KB Created: 2020-10-01 12:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 13ae71226ff5c18a86e61d5710935df6 SHA-1: 4e81779271368703c989d52861b1e282191685f6 SHA-256: 8979167aadaac595624592dfd2d5e00127defd24322997be3f9f75e15afe7e27
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically targeting users searching for 'best self defense books pdf'. The document body, though heavily obfuscated, also contains this lure. The ML classifier strongly indicates maliciousness, and the presence of numerous links to disposable hosting further supports a malicious intent to redirect users to potentially harmful content.

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 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://gettraff.ru/strik?keyword=best+self+defense+books+pdf In PDF document text
    • http://files.hounganjulian.com/uploads/1/3/1/3/131383283/fetejuvajuterudafab.pdfIn PDF document text
    • http://files.aoo1933.com/uploads/1/3/2/3/132303230/56171006f24.pdfIn PDF document text
    • http://werudefu.shoplevena.com/uploads/1/3/1/3/131398591/3036941.pdfIn PDF document text
    • http://pijakigok.lkmillsbenton.com/uploads/1/3/1/4/131438729/tazomilejevixibuv.pdfIn PDF document text
    • http://badogi.jasonrafferty.com/uploads/1/3/1/4/131407158/sikulotelozi.pdfIn PDF document text
    • http://files.gregorypelley.com/uploads/1/3/0/8/130813400/posaxumiro_walopowu_tanebogafezapo.pdfIn PDF document text
    • http://files.schsprojectgraduation.com/uploads/1/3/1/6/131607158/0b3284372f3d.pdfIn PDF document text
    • http://bides.thecompleteflute.com.au/uploads/1/3/2/6/132682704/41584fc2.pdfIn PDF document text
    • http://fuxidor.andersonoverheaddoors.com/uploads/1/3/1/6/131606165/jerer.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/5b5bc629-7db9-4a62-9e05-044881ce590f/retenonodozopasalejeruxuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f928ec-c1a9-494a-b97c-773ad97703c3/negukijumaralogikobegamux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02b58e2-7b8e-4d89-9746-e2176441bfe7/70483871732.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_off0000689d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x689D 4980 bytes
SHA-256: 0131fbb69637677a15f65c50cb22b3b03a32f31516a8299ca5fb7f1d64b47fdd
font_01_sfnt_off000079a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A8 9328 bytes
SHA-256: 596d4b35e8f11f785f9d8b2177ab00d5027d16309e17361c329f7774b6c336bc

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