Malicious PDF — malware analysis report

Static analysis result for SHA-256 945ce302d114cff6…

MALICIOUS

PDF

45.3 KB Created: 2020-09-30 06:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 89a079ebb97d93c851088df3aa8992dc SHA-1: d361a53f42491ec350ed863d7fffe020610a7a9f SHA-256: 945ce302d114cff69a9430116dcee79ad6f385b565a99d5697b5f25c818aa7f6
124 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to converting PDF to word and includes a URL that matches the malicious redirector. The presence of many links hosted on disposable domains suggests an attempt to manipulate search engine results or phish users.

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://cctraff.ru/strik?keyword=convert+pdf+to+word+programmatically In PDF document text
    • https://site-1036815.mozfiles.com/files/1036815/66096613325.pdfIn PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/24369284265.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/fenekarojuguvesixipe.pdfIn PDF document text
    • https://site-1036818.mozfiles.com/files/1036818/xeraxegonuwidopolomov.pdfIn PDF document text
    • http://gipimepew.gregkimseyart.com/uploads/1/3/1/3/131379655/4170092.pdfIn PDF document text
    • http://jebevo.corraleshistory.org/uploads/1/3/0/7/130775810/0c932f3c07bc98.pdfIn PDF document text
    • http://wuxos.busybeingbossy.com/uploads/1/3/1/4/131405965/9266651.pdfIn PDF document text
    • http://files.inteartist.com/uploads/1/3/1/4/131438474/4e652aaf8.pdfIn PDF document text
    • https://site-1036821.mozfiles.com/files/1036821/bopus.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/dusetipijupizufosok.pdfIn PDF document text
    • https://site-1036880.mozfiles.com/files/1036880/5025315875.pdfIn PDF document text
    • https://site-1036881.mozfiles.com/files/1036881/64149950688.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/c29f655e-759f-4361-9c7b-16380b5d8b59/792698163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45dde53f-0ed8-49f4-9aa9-e8eb753393d3/nakeruxa.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_off0000639f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 5364 bytes
SHA-256: b74bc0d8d085fd29b56c6df355d8b3bd4968c8ff0e6431c2f855f88ad06e84ee
font_01_sfnt_off000075e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75E7 10608 bytes
SHA-256: 6c68de6acebdbf93c15d88e74401f3c64bf98ace0d1b87f949c9e65b00721159
font_02_sfnt_off000099fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99FE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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