Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c5b4f1f98ef0f7…

MALICIOUS

PDF

64.5 KB Created: 2020-09-30 10:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 42c5534cc5931ea23a0cb0facd6b7bbb SHA-1: 1ad8115530f7f3376ca8beaaef14780fdc3ab044 SHA-256: 66c5b4f1f98ef0f7950b6a889dbb7df0eb36c7742e7f6b23a9957424b7214d53
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is 'https://gettraff.ru/strik?keyword=taittiriya+aranyaka+pdf', which is flagged as a malicious redirector. This indicates a link farm or SEO poisoning attack designed to direct users to harmful content.

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=taittiriya+aranyaka+pdf In PDF document text
    • http://files.mesapack253.org/uploads/1/3/0/9/130969046/8043916.pdfIn PDF document text
    • http://files.flapjacklapbooks.com/uploads/1/3/1/3/131381134/zozugirejob_zabum_pagij.pdfIn PDF document text
    • http://files.achswritersweek.com/uploads/1/3/2/7/132740270/vutetamowike-loparivukagitel-nupidiki.pdfIn PDF document text
    • http://files.rhamonabarberphotography.com/uploads/1/3/1/4/131437980/wiwodiketowu-dotebuwakej-gibetaka-divudafifadaf.pdfIn PDF document text
    • http://files.dudleypond.org/uploads/1/3/1/3/131381363/6416b6d77cb.pdfIn PDF document text
    • https://site-1037074.mozfiles.com/files/1037074/laxavinizegepovisow.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/kujuditovizamapibeva.pdfIn PDF document text
    • https://site-1036991.mozfiles.com/files/1036991/42655941035.pdfIn PDF document text
    • https://site-1037143.mozfiles.com/files/1037143/40959645778.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/14249885869.pdfIn PDF document text
    • https://site-1036902.mozfiles.com/files/1036902/fosogugiw.pdfIn PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/69659735041.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3386def-2daf-428b-ae0c-b407bc7eb536/9123032486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66cd883-0a23-4917-a74b-833527d1d70f/98072035676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a5232b-5fd4-42b7-9784-40c1700bd9f9/12692885491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2d6e1f-2f59-4448-b971-d60672059f82/81194838706.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3C1 4500 bytes
SHA-256: 9fdf6c7e142e1cf33f62ddaf8eb114d19ba56f3a65a2b8b18846b476dfd13178
font_01_sfnt_off0000b314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB314 10828 bytes
SHA-256: f3541ed10f104535c71cc0f706279c999bbe8da1c3e59c6b909f669eafe95549
font_02_sfnt_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
font_03_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 4040 bytes
SHA-256: 95f4b2f58931e7239da0ce91366b0da98e70d08454c399ebcc38cd2e5357724e