Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2c42019e4ec8bf…

MALICIOUS

PDF

43.3 KB Created: 2020-11-01 04:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a6cb0e6d52b87be2190d8d0038f7b9f9 SHA-1: 4cf41f05895f340067847def3756780f27420b16 SHA-256: dc2c42019e4ec8bfcea947bf3d6dbbce65e67cb7d7c87c7f091041bd1820b0ab
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of external links, many of which point to a redirector service. The document body, though heavily obfuscated, contains the URL for the malicious redirector. This suggests the document is designed to lead users to malicious content through a link farm strategy.

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://ttraff.ru/123?keyword=how+to+find+the+number+of+neutrons+in+an+isotope In PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/gofawopanekubowafaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_5f9819436d6ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_5f9903ff0854f.pdfIn PDF document text
    • https://tajekuludukomas.weebly.com/uploads/1/3/4/4/134498487/sedasema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tapexiw/gumenixogejujumobuguseluv.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/la_fuerza_de_sheccid_personajes.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/fetirepipejigawijaj.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/ccsf_fall_2019_online_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/ias_interview_questions_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3119/1975/files/5_morning_rituals_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/47092830630.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/basic_grammar_english_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/pegufeliwe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD4 5324 bytes
SHA-256: 25bcf1afc3a9749e75151fbc82995e056ab01f7e62afc63933c73eb7783f8146
font_01_sfnt_off00006fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC3 10028 bytes
SHA-256: c96a9b74973dd1d73c8e3fceface4b4383b0d4f2758b7af991c02f41fc0a813c
font_02_sfnt_off00009223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9223 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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