Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db7e54c4c07b14a…

MALICIOUS

PDF

48.0 KB Created: 2020-11-01 22:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2cf5785d6e4655fb5ff7d328e0911876 SHA-1: 9708df40eb0d3a6d6103e34be789d277f688a2b3 SHA-256: 4db7e54c4c07b14aa65f7cfaa61666ccfea8360a97fbb122c8939c0aaf2610d4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign-looking PDFs hosted on S3, but one critical link directs to a known malicious redirector. This suggests the document is part of a link farm designed to lure users into clicking on malicious URLs, potentially for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/strik?keyword=castle+clash+mod+apk+2019 In PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/jifiwaso.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/a7b88.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/b1f2e631cbd8a2.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/771447.pdfIn PDF document text
    • https://niweduval.weebly.com/uploads/1/3/4/3/134349673/gowewupizofu_moxajobir.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/mopulixopibegazip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_5f9e1a0645bcb.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/c5d1de51e.pdfIn PDF document text
    • https://jutivodip.weebly.com/uploads/1/3/4/4/134489611/6ef9330a5.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/tibanepoxilibud/hotel_collection_bedding_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/11794471345.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/atls_student_course_manual_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/vogikiwig.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/25201391962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a88a9526-a816-40a5-9ea0-2dd28eaeb3f9/revisezo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6577 5668 bytes
SHA-256: 8c0be853c5d2dadce9cd40ba1bcce367ae46995ca2cd43ec5e6d548b0c00262a
font_01_sfnt_off00007893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7893 10748 bytes
SHA-256: ea389d031872e44d9c918c2457b986dbadb0eefad288aa2f9ed08dc5ec9300d9
font_02_sfnt_off00009d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D86 16272 bytes
SHA-256: 7e3c665d02ee0a48e1923e1b8a614f2fa6b15db6db37b38eccd0bca32143fa5e

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