Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eb591ef8dc0a54…

MALICIOUS

PDF

45.0 KB Created: 2020-10-15 19:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8c38e68aff3c473798266d1bf9f47077 SHA-1: cd1cfbd2f5b3b9bfb162c1fe763b588e93ef7bb3 SHA-256: 88eb591ef8dc0a54df50f617f708941fd4b1c4038985f17a4634edc8a8e5df36
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/123?keyword=make+several+pdf+into+one In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f886dd714c09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f872af20abd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f87d2f580b6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f874aafb8519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8770f0cbc2c.pdfIn PDF document text
    • https://site-1048473.mozfiles.com/files/1048473/xuxemilobefedobiko.pdfIn PDF document text
    • https://site-1044310.mozfiles.com/files/1044310/83163632997.pdfIn PDF document text
    • https://site-1040600.mozfiles.com/files/1040600/xivisilegefedurel.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nimemoroligamaj-tafixidupara.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/91e26.pdfIn PDF document text
    • https://dejuxowiku.weebly.com/uploads/1/3/0/7/130738850/1259929.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/delelides_dasexurekiwar_jajumab.pdfIn PDF document text
    • https://site-1042354.mozfiles.com/files/1042354/58982162577.pdfIn PDF document text
    • https://site-1038948.mozfiles.com/files/1038948/96743093823.pdfIn PDF document text
    • https://site-1042104.mozfiles.com/files/1042104/oswestry_disability_index_instructions.pdfIn PDF document text
    • https://site-1041281.mozfiles.com/files/1041281/jiwedutifojixuti.pdfIn PDF document text
    • https://site-1041289.mozfiles.com/files/1041289/36561036475.pdfIn PDF document text
    • https://site-1040442.mozfiles.com/files/1040442/48102182044.pdfIn PDF document text
    • https://site-1039175.mozfiles.com/files/1039175/nitigejim.pdfIn PDF document text
    • https://site-1043220.mozfiles.com/files/1043220/34203778358.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2011/4327/files/davafomozujorogegesujo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9353/3886/files/xorinesipibabugegabanu.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_off000071b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B4 5164 bytes
SHA-256: d39cc010832ca786ba7f19fab5e17abf26c57d8a2b71f0ff33a85f256c0b7e6a
font_01_sfnt_off0000835f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x835F 10280 bytes
SHA-256: 1668b08ac70a7a3b0c0911a702b79bbcfe688259ddb3196ca8e7b557470ecb0b

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