Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbb207ff663437c…

MALICIOUS

PDF

73.2 KB Created: 2020-11-09 15:16:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7f2914cad82c08b4dfbe83ad9d9d70b6 SHA-1: 2aaa2ddad78feacecb46bf62d0b3f050c2601d83 SHA-256: 4fbb207ff663437cdfb8e1d6bae4849046930c8009445cbfac6e238187f84368
154 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 0.9998

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://cctraff.ru/strik?keyword=from+dusk+till+dawn+2+parents+guide In PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/vaweki.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/4820c16034fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_5f9dc24b45c0f.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/dae6d0d9-9d68-46b0-815a-404c02a55205/tecumseh_manuals_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/15750188485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9da5910-c0e0-4d18-bc74-d91341c70c62/6797013448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e920e4b-4046-4548-8d81-2d63db34ba77/i-85_exits_in_virginia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724609d5-9984-45a5-9976-ac25eec56b8f/76218603656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa05c2bb-7a33-4520-8105-1573dacbc35f/laxufagerimijumisatid.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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 5520 bytes
SHA-256: a2f75ba10f3e36635e77e47633848b3d6526e5c612bb4090e91b70a784b00f04
font_01_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 12948 bytes
SHA-256: a1c33bb87830074c245f975ac84ff104b4032b62363c05e1a0733eb1ba66b6ed