Malicious PDF — malware analysis report

Static analysis result for SHA-256 504e7b9d1ad0cffe…

MALICIOUS

PDF

44.9 KB Created: 2020-11-09 04:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2bbf76cb5ef44bf690872e0486724903 SHA-1: 860015424f9ace614e2d61d1fcf44af2f071a5e3 SHA-256: 504e7b9d1ad0cffec0148e9ba82fc5566a25631da17147d7ba0ade53ab752ba4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The primary URL, https://trafftec.ru/123?keyword=css+secrets+pdf, appears to be a lure, while the other links likely form a link farm. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a malicious SEO or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?keyword=css+secrets+pdf PDF link annotation
    • https://noxurujoba.weebly.com/uploads/1/3/4/3/134384046/femofulojizexojixexi.pdfIn PDF document text
    • https://mezuxanivatanid.weebly.com/uploads/1/3/4/4/134499991/muzam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_5f937be7e4dd7.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/3257372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_5f9adefe2a223.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://sefenubif.files.wordpress.com/2020/11/53611136376.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/28776462944.pdfIn PDF document text
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdfIn PDF document text
    • https://somezim.files.wordpress.com/2020/11/east_horsehead_lake_fishing_report.pdfIn PDF document text
    • https://buvimed.files.wordpress.com/2020/11/reactor_idle_city_build.pdfIn PDF document text
    • https://sebuwisawos.files.wordpress.com/2020/11/fipupojuretis.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/jonathan_strange_and_mr_norrell_book_2.pdfIn PDF document text
    • https://tobotuv.files.wordpress.com/2020/11/estrella_de_cinco_puntas.pdfIn PDF document text
    • https://paseneg.files.wordpress.com/2020/11/othello_norton_critical_edition_free.pdfIn PDF document text
    • https://nijubar.files.wordpress.com/2020/11/xirodimugopuviguji.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F31 4452 bytes
SHA-256: 69ae804f7345e89f95530856fed7abb865771b036f1e2f40b81bb4f37f58453b
font_01_sfnt_off00005e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E64 10760 bytes
SHA-256: dc1b5c4d016b904f56d4b76e177a8793cd8ac0cf9d1eb0c3f2988953f039bd50
font_02_sfnt_off000082b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B8 16376 bytes
SHA-256: bc7e3f6831be34686de02ce7be2a06b9f1fa2b1a298201cd6e3dc3baf4672bf7
font_03_sfnt_off0000985f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x985F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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