Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff098992d9a8b377…

MALICIOUS

PDF

40.6 KB Created: 2020-11-03 23:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a835844980c50a9c323d23af6a19ec13 SHA-1: 0fe3b391b4d37d374706324ac4fa8a84ff0eef29 SHA-256: ff098992d9a8b377e537f6b0354dc7e2c6c910a0b8601e8f3270938990b84198
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to lure users to malicious sites. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm on disposable hosting.

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 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://ggtraff.ru/wb?keyword=nobuyuki%20tsujii%20sheet%20music In PDF document text
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/6412549.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5650151.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/voremuxurok_majegisaxosuku_sitirakikupazi_legobe.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.pdfIn PDF document text
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/35297e63e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f9b324eee4c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3d366881-0801-4943-a1ec-8e089eda79b5/95968975240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516475c3-26ad-41d5-9b13-c1a1233802bc/18106813749.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6190/9950/files/98903792379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9038/6337/files/82713372185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d19ff3d-321a-48f1-97b0-928c99059e4e/vasowijuwefutogowavewer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be58255-8c7c-4287-91cb-105d2f10b1aa/5e_damage_over_time_spells.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4829 3072 bytes
SHA-256: 5373cce9e378fe722d43ee8cf089aeb12fb84a36783b0e1cf1bbfe80247a957a
font_01_sfnt_off0000531e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x531E 4828 bytes
SHA-256: d84a39c6498d4b5d1f5b35ecf41dd52a0ae44e9764688632081ea9e16724a1ba
font_02_sfnt_off000063a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A8 10276 bytes
SHA-256: b2b9c229321d9ead0bdafedeb71e8fba6dc0eac1765811cb28cb32ae785d00da
font_03_sfnt_off0000870c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x870C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.