Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ba70602dfff3d6…

MALICIOUS

PDF

48.1 KB Created: 2020-10-28 11:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8377301c1d43fd1487b1e73575e2b4e1 SHA-1: 9a26ea0b6024d3525cc73f34de3459b9272d19f4 SHA-256: 74ba70602dfff3d62a4e986c4eb252b167b2c0b87227a7e2d3d655f24e3517f4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to SEO-optimized PDF documents hosted on S3 and Strikingly. One of these links, https://gettraff.ru/strik?keyword=python+string+to+float+with+comma, is identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=python+string+to+float+with+comma In PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/7911743.pdfIn PDF document text
    • https://kuguzozivef.weebly.com/uploads/1/3/0/7/130739994/zevokimasisuvo-guvatevuroxe-paxerofaluwa-bijebubufovaz.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/vafupaporejuk.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/1939141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f88156eb194f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5f8eeba72d840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5f9314a653ae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5f9160aedf938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f876280bac7c.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/jufowokedunod/cours_de_l_amplificateur_oprationnel.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/89238222442.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/aulas_de_ingles_em.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/finobifonamozagijubifubum.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/fundamentals_of_biochemistry_for_medical_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd054656-bcc4-4efa-84bd-1bca204f4272/77368098189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edde9743-6cb9-4fc5-94bd-b196e211f4bb/eitim_psikolojisi_binnur_yeilyaprak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2077165-4745-45a1-821b-fbcff3c40396/constructive_living_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f50eb4-9edd-4c8d-a057-3fa8581a070c/jipezugowifikiveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86b37ac-e349-4d5d-ae8c-56add598c95c/zoniponixixidegama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2381/7640/files/descargar_f_stop_gallery_pro_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3840/8345/files/custom_enchants_minecraft_plugin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0377/9504/files/piping_isometric_drawing_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1335/6194/files/54118234994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7071/6579/files/lofatejupulejitosupopile.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_off00007a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A73 5488 bytes
SHA-256: 324096f8db3d1dd2462172fbb08b5f1eb0261555e2c514677befa8842ad07f4a
font_01_sfnt_off00008d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D02 11380 bytes
SHA-256: 7f285809710e9bef74cde85454021ed09d60b8fd64d5fb73b25cbcb8679a4cfe

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