Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efaef127e3b50f5…

MALICIOUS

PDF

76.5 KB Created: 2020-11-07 00:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: efea020815d7598fdad74799307e909c SHA-1: 701bdbf46a620c8a0b7c0114f4c94f704b23faae SHA-256: 4efaef127e3b50f50aac5a6d2e8889381789288edcb49b644f43e8d2b7b96b78
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a lure for 'Roblox robux codes 2020 april'. This link, https://traffine.ru/aws?keyword=roblox+robux+codes+2020+april, points to known malicious redirector infrastructure. The PDF also contains a large number of external links, many of which are to PDF files hosted on file-sharing services, suggesting a link farm or SEO manipulation tactic. No scripts were extracted, but the presence of malicious links and the deceptive content strongly indicate a phishing or redirection attempt.

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://traffine.ru/aws?keyword=roblox+robux+codes+2020+april In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fa1e18de8296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f9517a231c05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5f8d631f0002a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5f8d62931285b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wajujifeluxu.files.wordpress.com/2020/11/xatusaxolukowogetotoz.pdfIn PDF document text
    • https://pigazox.files.wordpress.com/2020/11/92675043523.pdfIn PDF document text
    • https://gebirev.files.wordpress.com/2020/11/1023677649.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/miss_universe_2005_top_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fbb318-eeb7-45a4-aab3-5b870c495a09/advocacy_job_cover_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/shareit_download_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f8ee8e-e9bd-4bcf-80a6-2695c82dd08d/mozorolesojawozilupipezur.pdfIn PDF document text
    • https://towuputuwome.files.wordpress.com/2020/11/robeledabikikulogowiparoz.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/wauseon_elementary_school_wauseon_oh.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_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 5556 bytes
SHA-256: 83312a5f205578730c3618a65048414e60b18dc29f555ee1a19838931f98740a
font_01_sfnt_off0000fa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 13636 bytes
SHA-256: f7ef24c696017e92640b58dc12768b248e73362d4ae6bcc4168884d7fd88af59

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