Malicious PDF — malware analysis report

Static analysis result for SHA-256 5625c610ae7cdda1…

MALICIOUS

PDF

33.9 KB Created: 2020-10-05 01:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5502596520eb39aa51c090d3d0e33f69 SHA-1: 54db9a4b45b3c97e13204f106dbcafbd6d34777b SHA-256: 5625c610ae7cdda16659341d49980aa480676ad731b26e03d10c0ddad2d653f5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, including a primary redirector link to 'ttraff.link'. The document body, though heavily obfuscated, appears to contain text related to 'Knaack tool box parts', suggesting a lure to disguise the malicious intent. The presence of a malicious redirector and a link farm structure indicates an attempt to lead 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://ttraff.link/pify?keyword=knaack+tool+box+parts In PDF document text
    • https://site-1041486.mozfiles.com/files/1041486/48481207160.pdfIn PDF document text
    • https://site-1039253.mozfiles.com/files/1039253/sezujutiv.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/dudafododidudamixab.pdfIn PDF document text
    • https://site-1037238.mozfiles.com/files/1037238/159451193.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/71967592566.pdfIn PDF document text
    • https://site-1038796.mozfiles.com/files/1038796/paganosajolevugidobuzafu.pdfIn PDF document text
    • https://site-1040509.mozfiles.com/files/1040509/80303492042.pdfIn PDF document text
    • https://site-1038311.mozfiles.com/files/1038311/nafibefopavifufipodup.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/3183aee8-c05e-4736-8bf4-200ef45dce70/61120686494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624622dd-730f-4d28-b18e-3c587df7e41f/wifibafowusixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa601cc1-8558-444c-970d-029900aa1aa1/83228667824.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9123/7791/files/maytag_8114p732_60_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5789/2506/files/9794270059.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_off0000439f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x439F 5168 bytes
SHA-256: b000e4ba06184bf378ae6b0e640027a16d2b7cc627e1d464868e6ed9e3e6fbd0
font_01_sfnt_off0000553f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x553F 10868 bytes
SHA-256: 85fcd524c2aca520b3c4273d8ef2a9d1027261bdc8ec4da0c3d7faad424e592c

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