Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd13be6ec76816ca…

MALICIOUS

PDF

50.6 KB Created: 2020-11-07 07:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-02
MD5: e64d4d39ca6cb935c515c9964e68cd7d SHA-1: bc02b9b0bd58b85c754c2718fcd8bb2d694d9d45 SHA-256: dd13be6ec76816cada4efc8cb149d8aacbe98968a96fb182f4e20b9892873b6e
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://trafffi.ru/123?keyword=blackwells+butterfly+world In PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/5bcf22648fa66dc.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/nigenilaridus_tunojebobek.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/muzudipefikimaros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fa2789912a99.pdfIn PDF document text
    • https://zazetafulunemu.weebly.com/uploads/1/3/4/5/134599809/mimegubofiwo.pdfIn PDF document text
    • https://ruvazokof.weebly.com/uploads/1/3/4/0/134040659/mulodidujadusoluzuja.pdfIn PDF document text
    • https://jabezenenadako.weebly.com/uploads/1/3/4/2/134234778/videduzovazuretax.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/946536.pdfIn PDF document text
    • https://nimewoguvinu.weebly.com/uploads/1/3/4/4/134433183/4383004.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/rojebulujumetubofusu.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/muzafujuri.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000871c.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000871c.bin)
    • https://uploads.strikinglycdn.com/files/ec506f51-a0e4-49ae-bd9c-3c8626aa1037/cswa_practice_exam_answers.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.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 extracted file (font_00_sfnt_off0000871c.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000871c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x871C 5460 bytes
SHA-256: ee30d364b9d893bbfaff8ed0d2f447191a8c238401b694627d7cfbbcccdda7aa
font_01_sfnt_off000099d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99D7 10556 bytes
SHA-256: f5b54b4d40439d3c3b3306ddebb728d85bf349df3cc53c6b04b445dd868bc796