Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78b93532093d3aa…

MALICIOUS

PDF

39.0 KB Created: 2020-11-02 11:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3bbe1389b9a4e13ebe2d0d5018022c28 SHA-1: 59654f32cbf3eadb166914c90802635c8579271f SHA-256: c78b93532093d3aa4b6e3796c63e7cc466e74841b26458243a300d561b349be9
154 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 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://cctraff.ru/strik?keyword=zt2+zeta+designs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_5f92ded66d134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5f9bac5e10c35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f89069306bf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_5f9b6c5b1cdfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5f91ebcbe1754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f875879136b3.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/jolufozo/real_number_system_worksheet_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/91316910774.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1087/3273/files/f1_2020_ers_manual_or_auto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3593/3895/files/dymo_letratag_label_maker_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/4460/6630/files/solid_explorer_file_manager_apkpure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1976/3364/files/pinadiluvinisebagogevoluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445d9920-586f-413a-abce-24659511faba/43389697698.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/bernie_s_green_new_deal.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_off00005855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5855 5004 bytes
SHA-256: ccbe3fd03900d6501a874e8d1af3ef4f41051821b6c9821191260ccdcd8267d4
font_01_sfnt_off00006978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6978 11692 bytes
SHA-256: 951486a702c07b51ccbac14266186a77fc573ec78f207dd730fa7697c01138dd

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