Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3d55bb2d1b3769…

MALICIOUS

PDF

59.9 KB Created: 2020-10-23 20:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 9cdc54a86db57d2c1e959f705f70ab79 SHA-1: 2887c20452a4760a451cd4f9fd2ca779655412fc SHA-256: dc3d55bb2d1b37694beab30d7dc469d2938dc5fa9ca6aefd2439acbc21e92602
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/aws?keyword=curso+de+ingles+en+pdf+completo+gratis In PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/15ba21d21caf.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/ferewi.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/5065904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f8d3c477e788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_5f8fbde78ec44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f8994eebc14b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5f8cadea3295a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f8abe679b35e.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/3670904.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/ff06dfdf.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/kukekuji_gokozomad_degaroziperure_wibomewib.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/penubudel.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/fujadabez/dna_polymerase_1_2_3_functions.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/dadurigonimigedeluletamaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4494/5051/files/48334015819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2433/4496/files/modified_instruction_for_ell_students.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3005/2005/files/ontario_guide_to_effective_instruction_in_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2490991-7480-4770-a92b-b44a893346e5/10182026563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57be3ae4-83bf-4702-88a0-d85098644bf8/leon_dufour_english.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_off0000a90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA90E 5380 bytes
SHA-256: 99977030cb48543a1ae0550f032882068e7300691bfc8dbc820d009cf91e22ed
font_01_sfnt_off0000bb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB41 11440 bytes
SHA-256: b229e6b0c603f5c93424af44a8254433268e9e28f9ae58e3d442b0113c7ce99a

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