Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87b3ccd8d7b9adc…

MALICIOUS

PDF

42.1 KB Created: 2020-11-02 21:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5f5980b6e732d0bc88b5211b97a06a17 SHA-1: 1ecd6b9ea157527ebdeca2fd88c20ee331ceff75 SHA-256: a87b3ccd8d7b9adc47e41459eb79867074924ae5950a22303c4284ee5a45fa2f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'eso price guide ps4'. The presence of numerous external links, many hosted on 'strikinglycdn.com', suggests a link farm or redirection scheme designed to obscure the ultimate malicious destination. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/aws?keyword=eso+price+guide+ps4 In PDF document text
    • https://nuvefiwepopowu.weebly.com/uploads/1/3/4/5/134502743/0f7c56d9a.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/5b6a3aa7-d498-4b67-8251-e4e9938a69e2/server_inventory_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af59971-a0ef-4124-b06b-469dd7c2101a/dalomudividuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c13a0f-c2c7-4f31-b964-1140fe32ec78/13562844583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98f88a3-9ddb-4a55-817d-e13006e7957f/bifurukogab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f6f73b-51b1-4520-8355-3fef2b9109d0/64315683018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ccdc9b2-b987-43fe-8064-b6c9a5aba4d4/nisokaselam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4583/8248/files/56342122486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4edde5-4951-43b9-8000-fe41622bbbe6/97061828571.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6458/9988/files/english_course_intermediate_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5070bbe8-588a-46e1-84d9-a57b2563c1eb/lolonozosoze.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_off00006594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6594 5044 bytes
SHA-256: c88d24dd729a39c592445b433a7de367cce87d85cd9e44bfbf25e2462086487b
font_01_sfnt_off000076d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D5 10972 bytes
SHA-256: 0f041c7561e0af4ce1fd4ad5e96677370c1d0ad33ba7a736209fe8299aa936f9

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