Malicious PDF — malware analysis report

Static analysis result for SHA-256 355b273ecdbac445…

MALICIOUS

PDF

43.7 KB Created: 2020-10-31 04:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 63536dfde91b923784f508d32aca05a0 SHA-1: 907af3c9bd0fa675bb54f1ff3decb6f181bbae54 SHA-256: 355b273ecdbac445c23720a59e3e716f8b7cf6677adad9b7ba92f163d037f18a
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, ggtraff.ru. Heuristics indicate this is a malicious redirector and part of a link farm on disposable hosting. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure the user to a malicious site, likely for further exploitation.

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 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/aws?keyword=contingency+approach+to+conflict In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f87d371877c6.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/ac76df623aaa29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f871fdba6965.pdfIn PDF document text
    • https://pujatimosu.weebly.com/uploads/1/3/2/6/132681823/4765087.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/d567f2.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/remisorab.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/760767c0f4.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/suxiweke/bedingte_wahrscheinlichkeit_aufgaben_mit_lsungen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4495/4527/files/mivituxojasemefixi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4851/5757/files/vazipabugoxawuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e1fdc6-6275-4f2a-82ad-52ef7bf6a67b/11281602223.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/buveluvozorukir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9903/6058/files/jaynes_probability_theory.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_off00006e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E17 5108 bytes
SHA-256: 83f935de1e2111d8b8ebd82bc259d150dfb780e79eb56dab97953313e852ad2f
font_01_sfnt_off00007f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F82 10260 bytes
SHA-256: eb46f160fa19730cecccc7a36e017c0e81a856fd8d0d7534dc1052193d4daadb

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