Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3af60e204837d7…

MALICIOUS

PDF

67.8 KB Created: 2020-11-07 17:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 530e8670c18aee170a2d479e9a640f7c SHA-1: 1a6bde4a01ded83db326da2e8f521581825d237f SHA-256: 5b3af60e204837d7a2685d98de0d91d9ae6aaec6d0194930252a5991896a101c
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://cctraff.ru/123?keyword=best+combos+for+snorkel+ops In PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/9401610.pdfIn PDF document text
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/ed06914c0e6.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/fdf17a0.pdfIn PDF document text
    • https://xajoxivanuxus.weebly.com/uploads/1/3/4/4/134432241/ce444aa37b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5fa5b2b44270a.pdfIn PDF document text
    • https://jotuxopa.weebly.com/uploads/1/3/4/2/134265841/zifosisadilimaxixa.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/xapidajovaji/gafalezoledubupiwuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/80348674386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1637704d-5671-4538-b72d-347d81129c37/zuxufopewutup.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/73850721210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6cfb4be-f46c-4466-b17f-890da6ea3087/nomexidimoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd66c26-9dcc-4388-a23b-b0fa5d83e31d/zabekawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53964eca-c50e-4153-a2ee-5a75212aad28/93796239933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b658af-9404-45c5-919c-2834e0de63aa/malimofexopedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08750cc-72a9-4484-ba47-8c1af072f1c1/suxumamotaxuvesikaxasut.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/bienvenue_au_quebec.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_off0000bbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBED 4944 bytes
SHA-256: 05d2a69b6537e641c1830ba2d7da8e036291c85c6c5eb73178f37f67534adcce
font_01_sfnt_off0000cc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9B 11692 bytes
SHA-256: 07ead67326e35c9dde69caebd77edaa3f4ecc74c47a717d72300757d659690c2
font_02_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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