Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd84114b2ebf9b8a…

MALICIOUS

PDF

41.4 KB Created: 2020-11-06 21:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 257d3e1a7e587005c643f6cf62325a03 SHA-1: c262cd2f43e4b1d91f502092ccf22a61b0e44024 SHA-256: cd84114b2ebf9b8a606f58ecee1325b1b1835a7f0d4de937e6e73dacd09c952f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The document body, though obfuscated, contains a URL that appears to be part of a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this is a phishing or content-luring document.

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/aws?keyword=medical+treatment+requiring+hospital+stay In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f9a89c1537d6.pdfIn PDF document text
    • https://nosuxiseliv.weebly.com/uploads/1/3/4/5/134578333/metetategogub.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/f3b87822.pdfIn PDF document text
    • https://togurekeve.weebly.com/uploads/1/3/4/0/134040335/nawefagagatutujuxexe.pdfIn PDF document text
    • https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/gizol-binobawi-vedinulo-vojedurevosud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_5f99db4a71ea8.pdfIn PDF document text
    • https://judiwufafa.weebly.com/uploads/1/3/3/9/133999980/tufewisumax.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/wogiselaruto-nokage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tibepitetuj.files.wordpress.com/2020/11/93704159793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed24470-ac42-4f45-bebe-cbc3a729be90/aa2_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88c0e76-3e83-41fe-b338-f272974013ea/12879891308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20b3739-71fc-4511-b069-0aa1e7e577dd/phim_nguoi_lon_danh_cho_nguoi_viet.pdfIn PDF document text
    • https://vodideropumu.files.wordpress.com/2020/11/fizawajemameruvigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb5c05e-37d6-47a7-bcac-f67bc02be784/65793732045.pdfIn PDF document text
    • https://saridejawe.files.wordpress.com/2020/11/23021503280.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_off00006444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6444 5720 bytes
SHA-256: ddb9770180293b55dd905caa5e21b4d631d4f4f1e8f7a89bcebb4c45279ef1cf
font_01_sfnt_off00007794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7794 9684 bytes
SHA-256: b8df3b85503b868853e2cc43f4f752fbee316b6cfbfbb931111a002ac4fadebf

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