Malicious PDF — malware analysis report

Static analysis result for SHA-256 b390e012b6b063e8…

MALICIOUS

PDF

46.5 KB Created: 2020-11-07 16:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 677a043fce1bd06fbadcc35be4611324 SHA-1: 274c4320e29f66da3c08f14991b51c1ffcbeeff9 SHA-256: b390e012b6b063e867c961cac7c4684bca30a2afff8f194c7f2aa4d02a8622b0
124 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting an attempt to lure the user to a malicious site. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or malware distribution attempt.

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://gettraff.ru/123?keyword=witchery+mod+golden+chalk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5f91b9abd3ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f92f15bb3644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f875d895c080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5f8c45790a456.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://bosuwepaxe.files.wordpress.com/2020/11/barking_up_the_wrong_tree_book.pdfIn PDF document text
    • https://panezij.files.wordpress.com/2020/11/37517484501.pdfIn PDF document text
    • https://mudupetem.files.wordpress.com/2020/11/fozapow.pdfIn PDF document text
    • https://vaxonaxex.files.wordpress.com/2020/11/doom_slayer_testaments.pdfIn PDF document text
    • https://wukobakuvev.files.wordpress.com/2020/11/84559218753.pdfIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdfIn PDF document text
    • https://jikuboji.files.wordpress.com/2020/11/bosibixival.pdfIn PDF document text
    • https://selogum.files.wordpress.com/2020/11/vitabibuvokane.pdfIn PDF document text
    • https://zetetojowu.files.wordpress.com/2020/11/change_management_models_comparison.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5352 5144 bytes
SHA-256: da98a9f000bd4ff7823758792f09c7b934a1125c0257c70e8bb47e3a1897319d
font_01_sfnt_off000064ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AC 11204 bytes
SHA-256: 815861eb4d52299db70024c7c381843c2a606c56f8478abab14241939eee8335
font_02_sfnt_off00008951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8951 16176 bytes
SHA-256: 69b5c4e74bfa4014eec982f6fa61be57a0c45b8ed87a8eab45b747eace745dd2
font_03_sfnt_off00009e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E66 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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