Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab46514bdefd0206…

MALICIOUS

PDF

43.2 KB Created: 2020-10-28 17:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b86338ba4e99920d57adbfa761a8e8d4 SHA-1: 2be861fdcfe48c8d8ae7f87bc5bf2552f7252fd9 SHA-256: ab46514bdefd020643908ec0c55b7b99f3756b1ec87b0c2aaefb4b5086fe7762
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm. One of these links, 'https://ggtraff.ru/strik?keyword=name+that+element+worksheet', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=name+that+element+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f8f1bcb7714f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f932e2c4e9ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5f8d4d664ad26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f8951fa4aa20.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/kixitavev.pdfIn PDF document text
    • https://nimewoguvinu.weebly.com/uploads/1/3/4/4/134433183/5332810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5f989aa48c76e.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/duwukijolakep-sasubidexup.pdfIn PDF document text
    • https://fufijejelido.weebly.com/uploads/1/3/4/3/134351462/3667177.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/kilaruvakix.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/pojojagajevuxa/which_of_the_following_about_the_biosphere_is_true.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/calendario_mundial_rusia_2018_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3298bd-570c-4dfc-91d3-830ec9a3dda3/14591325565.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/56394208572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6ebd80-519d-46fa-a677-599add71b859/49641373078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72cea129-09fb-4a4a-b575-d2a7dffa9f15/76950964806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49094d02-1233-4a2a-8567-8a239e2b1144/50379385403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb7d14a-5eea-439b-808d-c6e91e5f1bc3/zavedeganexadubig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39cf6c2c-32f2-4efc-a7ed-456ca324b251/xamexoxofagugiranin.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_off00006b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B03 5052 bytes
SHA-256: 3f8601e8d1d597a1d95456496b6fe628afc6d90418db3cea3e799a9fd2fb6965
font_01_sfnt_off00007c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C16 10436 bytes
SHA-256: 7ff1766204b7d3c77a33c47e2deedc72efde98b78dad02c86885240b47bd4543

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