Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db1139d54bed468…

MALICIOUS

PDF

43.6 KB Created: 2020-10-15 11:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0f93bc341eff5a5313a528540c412de5 SHA-1: f3fd9f2f53659cbe2d8a1f00cef247b5f42291ee SHA-256: 4db1139d54bed468782fe477cfa6fe27a3962ecc5296991126d38bfc618a00c9
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to disposable hosting, indicating it functions as a link farm. One prominent URL, 'https://ggtraff.ru/123?keyword=youtube+vanced+ad+free+apk', is flagged as malicious. The document's structure and the presence of these links suggest an attempt to manipulate search engine results or redirect users to potentially harmful content.

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://ggtraff.ru/123?keyword=youtube+vanced+ad+free+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f87cf62d02e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f8746a851276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f87cc3f909a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f87cd0ad6cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f876cd7eaf0d.pdfIn PDF document text
    • https://site-1040373.mozfiles.com/files/1040373/22547078232.pdfIn PDF document text
    • https://site-1039535.mozfiles.com/files/1039535/metro_kyoto_map.pdfIn PDF document text
    • https://site-1036798.mozfiles.com/files/1036798/bovafefudefokokid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f870d027c9b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8710cd257e9.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8c3f11ed.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/wirexanusir.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/peparaximezur.pdfIn PDF document text
    • https://mokitigek.weebly.com/uploads/1/3/1/6/131606839/27a098f0a370.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7835/1003/files/25264170076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3520/9127/files/kigemezozatas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1022/7876/files/most_famous_dance_moves.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4673/9866/files/chaos_james_gleick_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e299d439-7e47-4fb7-8f9a-8b18f9a2c583/34441454615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c5a6d3-a1fe-4791-8280-085d39891499/xazeluluzuduwopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea30319-634a-472a-8ac9-616c2bd5b2fb/72435209187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce07671-4043-4df8-b1d5-68955e627469/11538233953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b6d6df-ec70-432c-90f8-4e8509ac6e17/rugowowelobonagi.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_off00006c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C36 5164 bytes
SHA-256: 5a16e7f47b430b57db83c0d1b36fb8ed76bbaf64fe7fedbf8578f101f06689f7
font_01_sfnt_off00007dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDA 10184 bytes
SHA-256: 95834d14a34770bff10edce7649e66eee623e4715265f66dd8897125091847da