Malicious PDF — malware analysis report

Static analysis result for SHA-256 6218d2bc5cac95c6…

MALICIOUS

PDF

58.3 KB Created: 2020-10-04 08:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2e5e83b0292e175bcc5b70474e217f6f SHA-1: 33cc693e63b1518f63637353ff88c273f882d082 SHA-256: 6218d2bc5cac95c64f4e471f5e0286256c76da2c27c0bdbaffe2267154239862
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting it is a 'trophy guide', a common lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to malicious infrastructure via these links.

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://ttraff.club/pify?keyword=wolf+of+the+battlefield+commando+3+trophy+guide In PDF document text
    • https://site-1038552.mozfiles.com/files/1038552/gujetalet.pdfIn PDF document text
    • https://site-1039814.mozfiles.com/files/1039814/24839628502.pdfIn PDF document text
    • https://site-1036839.mozfiles.com/files/1036839/10447712612.pdfIn PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/salujiwibefosabesakevo.pdfIn PDF document text
    • https://site-1038358.mozfiles.com/files/1038358/vegipiba.pdfIn PDF document text
    • https://site-1038756.mozfiles.com/files/1038756/vonozefegimuba.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/zavojef.pdfIn PDF document text
    • https://site-1038453.mozfiles.com/files/1038453/89813291301.pdfIn PDF document text
    • https://site-1036627.mozfiles.com/files/1036627/68040051409.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0486/9908/0854/files/how_to_write_an_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e01391-b5b8-4360-9625-5080e1ec6590/jijuralajuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b45128-a863-4cbb-b9f4-661d6d6edf86/69505428298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f09a6d-b522-4cba-96c8-1151c0c198bf/11739619358.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89EB 5692 bytes
SHA-256: 44ecb0a86e9c9980660bdf388649cd879a2d705a4438caa0bf08e30e9393da95
font_01_sfnt_off00009d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D24 15656 bytes
SHA-256: 284d9a6efde71bd40eeb86b24238a6dd846147c4f1188c51007dcb711844637b
font_02_sfnt_off0000cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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