Malicious PDF — malware analysis report

Static analysis result for SHA-256 439898a94d63f900…

MALICIOUS

PDF

41.8 KB Created: 2020-10-06 11:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 988f130e2e07fc9cc128039f0c7c31c1 SHA-1: 87d05b50c2c42818e6e2efe262a4edbb53cd559a SHA-256: 439898a94d63f9006836c9be914805a5a49070b505b7680ca3bcf932d05a080b
184 Risk Score

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://gettraff.ru/strik?keyword=uc+browser+app+apk+download+for+android In PDF document text
    • https://site-1039534.mozfiles.com/files/1039534/8551241013.pdfIn PDF document text
    • https://site-1039419.mozfiles.com/files/1039419/bolosugokijezurugofim.pdfIn PDF document text
    • https://site-1043939.mozfiles.com/files/1043939/gewavoxewarofofu.pdfIn PDF document text
    • http://files.gulfbreezerotary.com/uploads/1/3/0/8/130813730/7614832.pdfIn PDF document text
    • http://zikara.richlandpac.com/uploads/1/3/0/8/130874210/de69a2.pdfIn PDF document text
    • http://files.gartdellearti.com/uploads/1/3/1/0/131071164/kimelibitu.pdfIn PDF document text
    • http://files.rockfieldboers.com/uploads/1/3/0/7/130776787/2441178.pdfIn PDF document text
    • http://zetem.iapmdelhi.com/uploads/1/3/0/7/130776791/zusurumituki.pdfIn PDF document text
    • http://nemiximit.biomarkerconsult.com/uploads/1/3/1/4/131406605/nujumuraradupuloj.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/68e8ed29-f346-4006-a3c1-02de862c5abc/nawufekometesuregotidab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b4ea0b-f6d8-4804-aa9d-c677e4c80d8f/79356570453.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_off000063c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C7 5436 bytes
SHA-256: 98fab4edd05ce28a12472885804b036b15aab32023959d7708b55adb9494c541
font_01_sfnt_off00007666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7666 10584 bytes
SHA-256: e45aa6b65aa0a212b945841cd440f366bde33d324a06d6d3b2d243a593b79e57