Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3356c4d1388774…

MALICIOUS

PDF

45.2 KB Created: 2020-10-14 21:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d3fcb7912044bd05dd919aed82cc5e70 SHA-1: a5bded24732bc985c2ef46d1ec9a27bb60970b69 SHA-256: 1c3356c4d1388774edef548bcfbfdea19c320a340a9338db4f3a2531e15f4289
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external PDFs hosted on disposable or SEO-optimized domains. One critical finding indicates a direct link to known malicious redirector infrastructure at 'https://cctraff.ru/strik?keyword=the+mister+pdf+book'. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/strik?keyword=the+mister+pdf+book In PDF document text
    • https://site-1039797.mozfiles.com/files/1039797/malixuxipiben.pdfIn PDF document text
    • https://site-1048452.mozfiles.com/files/1048452/bipikefujoladejo.pdfIn PDF document text
    • https://site-1038908.mozfiles.com/files/1038908/kofuriselabajoku.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/vaxukekiwurefebe.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/9625103.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/3718456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8710a487ba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f873d1647d50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8713af8ce79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f870157b2714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f871ce132531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f8720481a1a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f870e091e5fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8724de973b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f87061d0978e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f86fef68f1cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e4bd32-01fc-4b42-93c2-b897476780a7/xaboxedosarofofusava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a5cbbc-14ee-4166-9932-162577612f45/dexebuwegexavineloxofil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469e31a7-86b3-4aeb-95d4-b8743e8e4c98/3893924492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a12169d-249e-4013-9ab8-282025444d95/fotupidosafowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48015a20-aad0-4048-8f47-09724d9adb04/72943657933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5505/3472/files/jodegegimixu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6644/9816/files/58097829863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8990/6852/files/nose_piercing_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8405/3669/files/vanufete.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_off00007160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7160 5192 bytes
SHA-256: 2f97245a497d89724d11ac938c8a4f780ed2295abe0701fbf8bda2aab01ea8a3
font_01_sfnt_off000082de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82DE 10636 bytes
SHA-256: 9d40a8617468b6ba63b669cb452447b74919fc14bedb12df59e13e1dfb0f6efd