Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc891b4c264a173…

MALICIOUS

PDF

44.6 KB Created: 2020-10-05 01:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9189a21bca1bf7449b45d3db4bbaa27c SHA-1: 539017d40a1317c75a6cd29354e1b962a893f92b SHA-256: 0fc891b4c264a173091179aed0f177bb9789681aa6560c972bdb99582df017e8
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The ML classifier also strongly indicated maliciousness. The document body text, though garbled, contains a URL that is also present in the heuristics, suggesting a coordinated effort to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gettraff.ru/strik?keyword=tcs+medical+certificate+format+pdf In PDF document text
    • http://narago.plantmorenatives.com/uploads/1/3/0/7/130739353/bejakaniwojodeb.pdfIn PDF document text
    • http://files.pitzeradventures.com/uploads/1/3/2/7/132712127/fezajariz.pdfIn PDF document text
    • http://migeped.southernbreakers.com/uploads/1/3/1/4/131454065/mufafa.pdfIn PDF document text
    • http://mapizam.adamsteinbachonline.com/uploads/1/3/0/7/130776394/lemezoronokeb.pdfIn PDF document text
    • http://budob.everbrookefarms.com/uploads/1/3/0/7/130776795/33e71.pdfIn PDF document text
    • http://files.thetradewater.com/uploads/1/3/1/4/131454521/towiv_labinivig_wuruk.pdfIn PDF document text
    • http://jelot.cambridgeburlesque.co.uk/uploads/1/3/2/6/132681670/turiwab.pdfIn PDF document text
    • http://files.madbunnyclothing.com/uploads/1/3/0/8/130814397/jisubisedu.pdfIn PDF document text
    • http://piziropap.kingdom-mindedmoms.com/uploads/1/3/2/7/132710634/4194f7db.pdfIn PDF document text
    • http://xigopapus.foundationsfirst-ni.com/uploads/1/3/0/8/130814623/20375eae1.pdfIn PDF document text
    • http://bijojanok.downtownbaptist.com/uploads/1/3/0/9/130969744/tuxoza.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/1/0433/6756/3420/files/newman_smith_high_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6441/7694/files/cover_letter_for_assignment_editor.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_off00006db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB8 5248 bytes
SHA-256: 8862f7f90410adaa8b0cf1bc64e8dc4b72db1cd2beeb6e2fd9188df54c945bd1
font_01_sfnt_off00007f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7A 11796 bytes
SHA-256: 7629f965670f99eb1f3be14cca23f36d0ce122674d9af349ea4f2f4c84243645

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