Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa5bc8ff2eacb3f…

MALICIOUS

PDF

40.0 KB Created: 2020-10-11 13:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 23d22e95d9676a92fd2b20a24686e3a4 SHA-1: f26124039d4a51910a3a33745c8c01e9cf77fedf SHA-256: 3fa5bc8ff2eacb3fd685e0845c7e91876c19910282da725469b8c5f64265267d
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with many pointing to disposable domains and redirector infrastructure. This strongly suggests a link farm or SEO manipulation tactic, likely intended to drive traffic to malicious sites or phishing pages. The ML classifier also flagged this PDF with high confidence.

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/pify?keyword=burton+snowboard+bag+dimensions In PDF document text
    • http://ninak.meganwhitley-mastersinmedicaldosimetry.com/uploads/1/3/1/8/131857363/8346646.pdfIn PDF document text
    • http://files.bluedotbeadwork.com/uploads/1/3/1/4/131438570/zitavimig.pdfIn PDF document text
    • http://fusirig.shinyredcopy.com/uploads/1/3/1/3/131380623/7439877.pdfIn PDF document text
    • http://mijivobax.merutech.com/uploads/1/3/0/9/130969685/ximobiserowusedawex.pdfIn PDF document text
    • http://files.andrewshielscomposer.com/uploads/1/3/0/9/130970015/sarudowojegubigip.pdfIn PDF document text
    • http://gugete.chicagoschoolofgrappling.com/uploads/1/3/0/8/130814030/5153767e09.pdfIn PDF document text
    • http://vilaja.aviationaces.net/uploads/1/3/1/8/131856373/cd4278caea50c5b.pdfIn PDF document text
    • http://rozujom.yourworldtravel.pro/uploads/1/3/1/4/131437158/ed76b1.pdfIn PDF document text
    • http://lokubo.susanmerrillsquier.com/uploads/1/3/1/1/131163664/bazosuj_tesabapune_jorepusojikagom_sukilebebal.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/31cb5878-ef36-49e0-a9e3-a2d26702ab14/gejuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f462db10-7ca7-400d-9300-5e7257d89125/21018096663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98416be8-45fb-472b-8182-5e9d9fa147a7/zebevebijumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71aac65f-5bf8-48f2-8a95-632a467d452f/23971816913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb92b20-9946-490f-9b0a-e475e53ef7d3/43909754538.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_off00005e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5F 5396 bytes
SHA-256: eccbe682377dc43cdbb784c0aae946eea36f039a8b4b7a1fdfea3e09af26b1bd
font_01_sfnt_off000070ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70AD 10016 bytes
SHA-256: 309ea351bb38b5eb0027358860a20f426e7e80f481ba8f6ba713b180688533d2

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