Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e7e820ef773fa9…

MALICIOUS

PDF

49.6 KB Created: 2020-10-09 14:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b7d24db51ffa5c6182210aa8accdd3f SHA-1: fbfde87ac3e4cc814e5281e9cd9b46503ad95456 SHA-256: 39e7e820ef773fa93fb3a9e261bfb6f5cac858dea1e276f72e07940a8ef4376f
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to a 'skyrim mod configuration menu' lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same lure URL, suggesting the primary purpose is to redirect users to a malicious site, likely for further exploitation or phishing.

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=skyrim+mod+configuration+menu In PDF document text
    • http://linen.kateboothphotography.com/uploads/1/3/2/7/132710657/9496ad3.pdfIn PDF document text
    • http://files.halovolleyball.com/uploads/1/3/1/4/131453065/d3d783b.pdfIn PDF document text
    • http://moduvoro.aloenottingham.com/uploads/1/3/1/3/131380942/rubinulobowale.pdfIn PDF document text
    • http://palituju.johansenbaseball.com/uploads/1/3/1/3/131383314/gasuvufud-kawekuz.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/d9bca95a-dc50-440d-8657-1b03a5e5c011/mojig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373a54a2-7a44-416b-ab60-40d2ec4a383f/bawafaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7d65f6-4ccd-4991-b822-f5a1a13446fa/ridosekefapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0459/4856/files/52200585246.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/ice_machine_manual_fill.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3385/6664/files/how_to_use_tnt_in_minecraft_mobile.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4312/2083/files/collect_stone_from_a_fork_knife_or_umbrella.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ff6646-3794-4d6d-ac31-eb663f9c23ff/tarafobefilorilolurelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ee2a9b-2a30-4a5d-8c85-f2ec6ac2752b/3578515200.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_off00008263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8263 5400 bytes
SHA-256: ef4a7b656888d885850aefad8a1f096fd95ebd6efbdf28354c1abadd464b1cfc
font_01_sfnt_off000094b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B9 10668 bytes
SHA-256: d4379a17d99fb164104c757e681de848d214041a74ffabbc83fd809dbcbe702d

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