Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92350c3cac12748…

MALICIOUS

PDF

42.5 KB Created: 2020-10-01 22:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2637f7f363ab115446e1dd33cd5378e4 SHA-1: e93fa8de15def29dee14c644bebafc1f2f9f41cf SHA-256: a92350c3cac12748ad9774583069ee822993852f38ab501a6003a6b4f1969248
192 Risk Score

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=air+accident+investigation+reports+uk In PDF document text
    • https://site-1037164.mozfiles.com/files/1037164/24180930771.pdfIn PDF document text
    • https://site-1036923.mozfiles.com/files/1036923/ludukajapusodev.pdfIn PDF document text
    • https://site-1039380.mozfiles.com/files/1039380/jigibomozopesobilu.pdfIn PDF document text
    • https://site-1036800.mozfiles.com/files/1036800/98996080602.pdfIn PDF document text
    • http://files.upwardfacinglife.com/uploads/1/3/1/4/131436971/velolerulamur_baxafijirun.pdfIn PDF document text
    • http://mesafowej.lmcclassic.com/uploads/1/3/0/7/130776436/d5fe0196d3.pdfIn PDF document text
    • http://bedubop.raveninspection.com/uploads/1/3/1/3/131398589/fb44c7.pdfIn PDF document text
    • http://files.grahamedesigns.com/uploads/1/3/1/4/131438167/3450472.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/ccff0bd5-ca7c-4140-942f-b9f28199986f/pilizafatanazifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4348235b-1d35-45a6-9b60-68f875c3dd3a/94010972173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be0e9af-e7cb-4cf4-b754-f5a85348c52d/83649628862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d824df0-8eed-4ef5-8ab1-8b534d6bf35d/magelunarerajeliseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b0f72f-b5f8-4df3-9f3a-df7c134e2445/kijivugezikepurone.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_off000065eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65EB 5320 bytes
SHA-256: 6b00bf00d66ec501461ac8d0e005cae397c8a0f45267502ec612ec35e8216064
font_01_sfnt_off00007822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7822 10928 bytes
SHA-256: 3ac9ea7cebe9e557713dc281dd2a11cd29827003c274b59b726ff453c768a996

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