Malicious PDF — malware analysis report

Static analysis result for SHA-256 658b833ef66240e6…

MALICIOUS

PDF

44.1 KB Created: 2020-10-03 01:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 971d0b3507d7e9c056b7f5ae62bb9d64 SHA-1: 3ef77bee7c79b7b2c797fb5e205f30b9d427ded1 SHA-256: 658b833ef66240e6e4c4f1edcd8edcad606292407d19215ce24cb5b473308dfd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, 'https://ttraff.club/pify?keyword=metal+man+welding+helmet+ab8500sc', is identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.club/pify?keyword=metal+man+welding+helmet+ab8500sc In PDF document text
    • http://files.curacao-vakantievilla.com/uploads/1/3/0/9/130969205/36b15b1ee14b.pdfIn PDF document text
    • http://nolegi.pslerevision.com/uploads/1/3/1/0/131070450/bofasopazuj_bosusowabomo_woxegefesuj_kukomuled.pdfIn PDF document text
    • http://rutos.artsforactfineartauction.com/uploads/1/3/0/7/130776433/penaf.pdfIn PDF document text
    • http://xobat.nefsvanity.com/uploads/1/3/2/6/132681910/vefulisivel-gipudajifagug.pdfIn PDF document text
    • http://files.flowersbyflorence.co/uploads/1/3/0/8/130874237/xanawufigemet.pdfIn PDF document text
    • http://muridi.johndimech.com/uploads/1/3/1/4/131453853/5089206.pdfIn PDF document text
    • http://niwaj.explorebeyondborders.com/uploads/1/3/0/9/130969402/8851394.pdfIn PDF document text
    • http://bisurat.needsofmany.org/uploads/1/3/0/7/130775491/6c2a1246.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/6e9f518a-9b98-4987-8d00-eb9b0d3a1a43/roret.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3feb6725-b8c3-4464-99a0-ec2beb3c7cb3/peribovizosasoxodel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8892e90-3555-4b5b-bbad-9f4de0c51006/32380698096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215efdb9-dc65-4296-8247-544cfe5b0eda/23000129982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/432be530-ef15-44d2-8bb2-cad92dbc0ae8/29268916656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf82c1d-fd36-4c70-8141-beb1dd66bf70/5785084622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b7df38-3a29-46f8-8d2c-eb83900f3fb8/80792254308.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_off00006c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C38 5952 bytes
SHA-256: 1955db83a186951da4da3aafbd9b54da939ba1c7bdd29cafb9b38eef0873a9af
font_01_sfnt_off00008079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8079 10324 bytes
SHA-256: 9ed24351bdbee4c026b5ceb1cb6e7ad5421e986655b0c2e8339bd5dd5fcb8be5

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