Malicious PDF — malware analysis report

Static analysis result for SHA-256 8747d6ce20582c1d…

MALICIOUS

PDF

73.0 KB Created: 2020-10-30 19:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a564819ba76601c4ccc47f7670d78856 SHA-1: d5b23b11b954c089b1b99f8fd8f2bb679b51d0c1 SHA-256: 8747d6ce20582c1d14fae61dd1631e10f6d246ce2348e8d4550c5d867140e6e3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically a URL designed to lure users with the promise of 'Roblox free group members'. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute traffic to potentially harmful sites. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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=roblox+free+group+members In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_5f98e9313d25a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414687/normal_5f9b455779edb.pdfIn PDF document text
    • https://duxataravur.weebly.com/uploads/1/3/4/0/134017775/4c9bd6757c7080.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/zuxadol/makkar_ielts_reading_book_free_download_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/dinamica_de_sistemas_simulacion.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/22545841491.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/98629770885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f80271-0dfb-4c2e-a0a7-4d2251f397e0/siporokusupuvaxirulipavon.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/bams_syllabus_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3776cfaa-3486-42d5-baff-73ad70dd412d/24328072050.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/michael_kors_size_chart_shoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1080f2e9-98ac-4abc-b5dc-fd754c617987/96383359565.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_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 5224 bytes
SHA-256: 7ffb6a50f5bb3550f009ae68ec3cb1e7c822f9cea725f0ebc76cce62dc034ec1
font_01_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 9904 bytes
SHA-256: f635c49302ee61d92b29a7f453ff7f4b942ab8fbfd91951f75d92fba1bfa5fbb

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