Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f529185564726e…

MALICIOUS

PDF

56.4 KB Created: 2020-10-05 15:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 83c1996d610b05de728f311404a65d87 SHA-1: e2b3309cbfe6e82580d0a32e2ca35d0a6af79d49 SHA-256: 48f529185564726e26ccc419fc9d7bd052d00fb12bcaad0f3bde843f414f0d5c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, functioning as a link farm. One of these links, https://gettraff.ru/strik?keyword=sistema+de+inyeccion+multipunto, is identified as a malicious redirector, indicating a potential attempt to lead users to harmful content. 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://gettraff.ru/strik?keyword=sistema+de+inyeccion+multipunto In PDF document text
    • https://site-1036796.mozfiles.com/files/1036796/59411768750.pdfIn PDF document text
    • https://site-1044306.mozfiles.com/files/1044306/9801857698.pdfIn PDF document text
    • https://site-1036796.mozfiles.com/files/1036796/leselemaliruwudagegigab.pdfIn PDF document text
    • https://site-1036975.mozfiles.com/files/1036975/bigimenanox.pdfIn PDF document text
    • https://site-1044113.mozfiles.com/files/1044113/solamisugijejenoranu.pdfIn PDF document text
    • http://sosuxufi.kyasports.net/uploads/1/3/0/7/130740558/zavekitilikunaw.pdfIn PDF document text
    • http://files.carriecharleybrown.com/uploads/1/3/0/8/130814310/435c0e4579df.pdfIn PDF document text
    • http://files.pizzamia-hanscom.com/uploads/1/3/2/6/132682570/fujoxogalo_resetedegajigo.pdfIn PDF document text
    • http://jevusi.labradoodledelightsoflot16.com/uploads/1/3/1/4/131437889/3111613.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/8b3b741e-ce31-4619-acf2-6dc2cdfad03f/mamamajijepufekenugiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8317a2a9-6d82-46c5-9a24-e18f45ec01ae/39634402905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6d8840-95ae-46be-a0f6-43478241671d/puvujimubadodimivigad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0bc99c-1b53-4df4-b8a0-9e6405d5fb85/puvopixupasap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc00070a-04e8-4ec9-a117-9e43db21435a/54741568079.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_off00008be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE2 1832 bytes
SHA-256: 4166acbf109636613ee1e96ff5ae77be17a7f0622695885dd68dfbc5649411a9
font_01_sfnt_off00009443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9443 5328 bytes
SHA-256: d7d76bce270f2975d1055eb0637904d1db0ae0e5006d7c4e7ceef84f31dd3ee7
font_02_sfnt_off0000a65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA65A 14560 bytes
SHA-256: 34f80e7fde3cacd8f6cbdc0e4414d79bd20306c8985e854228d2a4202aeb4ff2

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