Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9fb2f534acda1d…

MALICIOUS

PDF

39.2 KB Created: 2020-11-06 00:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4dc477381e378fc25b6f1803740c2819 SHA-1: 37a41d1279b1eddbd808d04248f06c6f92795767 SHA-256: ab9fb2f534acda1d62f20df956549d511321ca3a58c8459d7f29694836f24cef
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'https://traffine.ru/123?keyword=ct+airast+portal'. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a mass external PDF link farm, with 'https://s3.amazonaws.com/gulapore/tanuzirike.pdf' being one of the linked documents. The ML classifier also strongly flagged this PDF as malicious. The document body contains text that appears to be a lure, referencing 'Ct airast portal'.

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/123?keyword=ct+airast+portal In PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/zokowekuvudelota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_5f8f68e30aeaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gulapore/tanuzirike.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/64686259336.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/17131064994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1681784b-dc5a-4318-99fd-da067489472f/mubunenisaxonix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d921114c-8234-46f1-9d5c-24e577393d3a/japanese_chin_for_sale_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5a7c46-e655-43f5-b797-6122c534c4dd/kendall_rento_mi_piel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6ea6a2-b35e-4daf-9461-a1a70e014659/franklin_high_school_mascot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6fb2ea-b608-4311-9ad8-a5a9be968e5d/77181628901.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_off00005b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B80 4720 bytes
SHA-256: f29a3fb7fbfdf2240d95cb99027e8959198c907415894ae55e3d9449f2bfc0f5
font_01_sfnt_off00006b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B93 11060 bytes
SHA-256: 695fd772b1ba7cc8310b3cc3c880cb104c6d0096e2622acfdb9a486c34ec254e

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