Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85b1a4c6f27a721…

MALICIOUS

PDF

45.2 KB Created: 2020-11-03 02:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b3f9e6f74e273648b4a96db89a39fd84 SHA-1: ee645c430359505375422c1f462474ddeb0b9b6a SHA-256: a85b1a4c6f27a721084785f07bad7dc224e2c8d098a8448616b544a01a3e19f3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links, including one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to artificially inflate search engine rankings or distribute malware. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits.

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 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.
  • 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.com/123?keyword=power+rangers+theme+song+lyrics In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5f9adc324c725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_5fa09a15bc1ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f89de41c9a25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f93ec1b8470d.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/gevadovuwo.pdfIn PDF document text
    • https://kuvejepi.weebly.com/uploads/1/3/4/4/134452054/vomuzenomemolol.pdfIn PDF document text
    • https://sufimaxunexex.weebly.com/uploads/1/3/4/3/134345405/mofaxokepimigegexur.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/zituba-jufukufegol.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/1393d193-b9f3-49d8-b9f8-6d14b8bb8fe8/mados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f855433-7c0a-4cad-b33e-b4b5ade92789/descargar_novelas_romnticas_en.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/16006819533.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/hp_envy_7645_printer_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/lukonirozavizekutaju.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/descargar_adobe_reader_gratis_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/varugogubasagupedo.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_off00006f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8A 5408 bytes
SHA-256: ee4c80c35117df2d4117d8499aa65901ebd36fd5ec2aa94fc9818c0c73b4f626
font_01_sfnt_off000081e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81E3 11388 bytes
SHA-256: eb8dd0f3f3b051f9b392d9d636f2fed8cefa6f380dd081441267d84994c7a499

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