Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da62fa266265a82…

MALICIOUS

PDF

59.0 KB Created: 2020-10-10 06:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d739347265fae4d032ef6a4cca1b1a9f SHA-1: 5005f3481e7d1e82d71f8867d88d2df4a2d6ffcc SHA-256: 6da62fa266265a8218edb9e65ba316f5098f74c2c838f6937b7004b08bd0a67f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to disposable hosting and redirect to malicious infrastructure. The primary redirector URL is https://ggtraff.ru/strik?keyword=flipped+book+pdf+online, suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly indicated maliciousness, and the structure points to a link farm designed for SEO manipulation or traffic redirection.

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://ggtraff.ru/strik?keyword=flipped+book+pdf+online In PDF document text
    • http://nebego.singinghistory.com/uploads/1/3/1/4/131454165/vudukis.pdfIn PDF document text
    • http://jozixile.lightoftorahpilgrimage.com/uploads/1/3/1/6/131636719/dagovaronukaxikofo.pdfIn PDF document text
    • http://files.southseattleoto.com/uploads/1/3/1/4/131454770/tadedopapezedur.pdfIn PDF document text
    • http://selaj.inspirationafloat.co.uk/uploads/1/3/2/8/132815154/koxovipixig_kanurevezal_rupafefipo_dalijudegapa.pdfIn PDF document text
    • https://site-1038737.mozfiles.com/files/1038737/13226555669.pdfIn PDF document text
    • https://site-1037156.mozfiles.com/files/1037156/30408129605.pdfIn PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/tejiwi.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/35004789068.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/3b47086d-7c5f-4889-a08c-669a250ede7a/jizojisare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae1ca4e-9e5f-433e-a2ed-f5ff8b58da8c/goladezawuzesimalok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd000367-9b01-4d92-97eb-d56bda7c9332/12564379375.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6951/4143/files/c7_low_voltage_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8934/7228/files/carl_sims_3_death_flower.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_off0000aa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA48 4712 bytes
SHA-256: 3a530ede7483148a5a196988035e4f010dec799bde6329c208860471fbfbc9b8
font_01_sfnt_off0000ba64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA64 10908 bytes
SHA-256: 51b18467c0cc4736e2b4e28c1d94507c158a473b781f7d1585a6a1291f57f5f2

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