Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f75df3d8deaa165…

MALICIOUS

PDF

74.5 KB Created: 2021-01-15 19:44:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 06376169974f5d3ebb311b6be54a3281 SHA-1: 8a093b95b7707923b1bcb9c81935ad59d7cde65e SHA-256: 6f75df3d8deaa16581112f0f69533b862f50d91daefec369aa2ca832c42f6e4d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, suggesting the primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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?utm_term=510+area+code+zip+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fa123042aef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5f9ca6204fddf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_5f9fe072cc21b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fa8cca246ba2.pdfIn PDF document text
    • https://fenotitejov.weebly.com/uploads/1/3/5/3/135316040/9092586.pdfIn PDF document text
    • https://site-1174586.mozfiles.com/files/1174586/transfer_contents_of_iphone_to_new_iphone.pdfIn PDF document text
    • https://buwutele.weebly.com/uploads/1/3/4/4/134450545/wofoxotu.pdfIn PDF document text
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/b0ebe3.pdfIn PDF document text
    • https://site-1172255.mozfiles.com/files/1172255/xeludozudin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481993/normal_5ff7765ca8fd2.pdfIn PDF document text
    • https://kapiluruge.weebly.com/uploads/1/3/4/6/134672566/6902802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5fa7f8604eaa5.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/sakaburepagase/windows_10_gratis_italiano_completo_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/toefl_examen.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/pdf_file_download_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/bejeweled_2_apk_free.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_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 5132 bytes
SHA-256: 04567aa6396a541c023884f83a436e7a27fa002fe9c6a8cf5fb89f6ed5c085a8
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10408 bytes
SHA-256: a14dda9fe476d995dc0ecc9533627483aa9a714630014ba134832ca4aade3c4d

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