Malicious PDF — malware analysis report

Static analysis result for SHA-256 358ac8b107a78297…

MALICIOUS

PDF

48.1 KB Created: 2020-10-15 14:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3892768a0117a0b76a5c64dc80ac388b SHA-1: 769ff2d6d4f79a3a5b76bfa7052d83cbfabc8e08 SHA-256: 358ac8b107a7829780996c65acc328ecf4b67f19e2b842ddfd924b82fed4ae7e
132 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a lure to download an application, likely malicious, by presenting itself as a service manual. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=cable+tv+live+apk In PDF document text
    • https://site-1043172.mozfiles.com/files/1043172/free_yamaha_motorcycle_service_manuals_for_download.pdfIn PDF document text
    • https://site-1039778.mozfiles.com/files/1039778/29273189403.pdfIn PDF document text
    • https://site-1041609.mozfiles.com/files/1041609/kejuduzugejiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f87d610bd712.pdfIn PDF document text
    • https://site-1038531.mozfiles.com/files/1038531/18028886546.pdfIn PDF document text
    • https://site-1043292.mozfiles.com/files/1043292/vutum.pdfIn PDF document text
    • https://site-1048248.mozfiles.com/files/1048248/gallery_pro_apk_onhax.pdfIn PDF document text
    • https://site-1043174.mozfiles.com/files/1043174/votekusine.pdfIn PDF document text
    • https://site-1038421.mozfiles.com/files/1038421/21192613281.pdfIn PDF document text
    • https://site-1041405.mozfiles.com/files/1041405/wuvugonewewefixananagub.pdfIn PDF document text
    • https://site-1041491.mozfiles.com/files/1041491/tijewexofurak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f872880488f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f87e22b71318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f87418819f0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f8815d12067a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f870e3f95294.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2147/8299/files/2010_secondary_solutions_romeo_and_juliet_answer_key_act_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4259/7795/files/gymnosperm_and_angiosperm_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A95 4708 bytes
SHA-256: b41c221268f818f16dd9e6c01c09734fee021f12297af29c61eea53d2d3f7345
font_01_sfnt_off00007ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB3 10272 bytes
SHA-256: d68bdd24506da2f124c1bce9e53c0ada1536f17633880339974f307b71c9ccd7
font_02_sfnt_off00009e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E14 16064 bytes
SHA-256: 723e6034cfa8adeebabcb44fcd9a81d05c7492831ad3e7dd1a7a87e114838b67

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