Malicious PDF — malware analysis report

Static analysis result for SHA-256 898b794d7d47f7f5…

MALICIOUS

PDF

46.4 KB Created: 2020-10-28 12:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0268cdace0dd4100a8693ff7edd18f79 SHA-1: 95a6fd52abdfb4caa2df2a440e836b80ba914b8c SHA-256: 898b794d7d47f7f54210aacc8062fefc933a44658a70aec0cb1605e5604f30a9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.com/123?keyword=medium+clue+osrs In PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/5014cfe.pdfIn PDF document text
    • https://ximinelinax.weebly.com/uploads/1/3/4/3/134313791/jifezop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_5f97a5338bc75.pdfIn PDF document text
    • https://dujenavu.weebly.com/uploads/1/3/4/3/134366251/rowukuweluzagusew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_5f8cb85ae5cd0.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/zurozagedimel-wenexajegubes-dulufine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8b73f2c1297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f88793dd0f6f.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/suzemumawetup_tolufitites_rupoxobuga_figero.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/xafapivukowezinul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5f954715ea47d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8724576e0ff.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/memul/agriculture_file_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/76312411203.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/25992995680.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/principles_of_biochemistry_lehninger_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/jikikatelufu.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_off0000760e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760E 4880 bytes
SHA-256: e1b7708f4783396cbf6e51e4f094c5e76cfb0d137e3ca5d5b06ce03f4a60a108
font_01_sfnt_off0000869c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869C 12260 bytes
SHA-256: 7bc8fa39a5614b2fd0895b2bdd6db6e9f9e0421edcef08da255823236b0fe518