Malicious PDF — malware analysis report

Static analysis result for SHA-256 163562c65ed75683…

MALICIOUS

PDF

43.4 KB Created: 2020-10-10 05:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 591ea583a281380385f7e32c263a5ac2 SHA-1: 65e9518fd5090eb9b6665ebdcfd9af60be91c93c SHA-256: 163562c65ed756835acde8baca111f1ba701f2dd48f1d37a21831acf7440a1c7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=sb+hacker+apk`. The document also functions as a link farm, with many URLs pointing to disposable hosting, suggesting an attempt to distribute or redirect users to malicious content.

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://cctraff.ru/strik?keyword=sb+hacker+apk In PDF document text
    • http://files.lakesidepaletteclub.org/uploads/1/3/0/7/130775106/mopen-fawenararifosip-finuw.pdfIn PDF document text
    • http://refifo.gnslasvegas.org/uploads/1/3/1/4/131408027/pukuleroxinawi-ditomemukakozer-dugibelisemuve-boxufolud.pdfIn PDF document text
    • http://mudulet.oasisgaming.ca/uploads/1/3/1/1/131163981/wakumi.pdfIn PDF document text
    • http://wiruvug.1798bbq.com/uploads/1/3/2/8/132816091/fazoge.pdfIn PDF document text
    • http://tires.balconisupiazzadante.com/uploads/1/3/1/3/131379956/lugupumuzok.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/lexutotowezusobim.pdfIn PDF document text
    • https://site-1038675.mozfiles.com/files/1038675/tabekulukagatan.pdfIn PDF document text
    • https://site-1039661.mozfiles.com/files/1039661/2353971795.pdfIn PDF document text
    • https://site-1036746.mozfiles.com/files/1036746/67577966711.pdfIn PDF document text
    • https://site-1037843.mozfiles.com/files/1037843/73497350852.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/4fc855f4-b924-4cf1-b9ca-74d2d8f8993d/66558976840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c4c964-626c-4521-ba82-72f12ff4cb88/53356976037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390c72ca-e4cf-4088-aa8d-70969ca6b05f/taxaliruwisaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c82b745-408a-49df-a9bd-af2951b6a454/90509866103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7fd356-b733-4ef5-ac48-1a6802bc0310/zozog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/2131/2415/files/80173111267.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_off00006268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6268 2952 bytes
SHA-256: 013fc9f45313cdddd5762e6694753e55f6a85ad2eec225b6e17fd140af1ee5c7
font_01_sfnt_off00006cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF7 5116 bytes
SHA-256: ee1dc7519db9f7218f70beae5888d3d8b6be0d195d7f41e7efd7676ade66aac1
font_02_sfnt_off00007e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5C 10036 bytes
SHA-256: 0de72431cc58015982126ca689bf6c85d879afbf129d72eb6b66bc503af19904

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