Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e98b5d08c1668ff…

MALICIOUS

PDF

50.4 KB Created: 2020-10-12 16:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 137a58350377d72920047cb400d27144 SHA-1: 24f6d74b73c799ce145c46d697bae618dc29a27e SHA-256: 6e98b5d08c1668ffc1c1f9c6c62bf8e067d4c87072558760582add66cb43797c
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection attempt. One prominent URL, 'https://cctraff.ru/strik?keyword=java.lang.runtimeexception+parcel+unable+to+marshal+value+android', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL and other links, indicating an attempt to direct users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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=java.lang.runtimeexception+parcel+unable+to+marshal+value+android In PDF document text
    • http://kowujosu.kielcoffee.com/uploads/1/3/0/7/130775961/vebis-dumuradafew-lipovinutilewe.pdfIn PDF document text
    • http://files.nickpateras.org/uploads/1/3/2/7/132710655/d914f150ae.pdfIn PDF document text
    • http://files.bridges2learning.net/uploads/1/3/2/7/132740701/kiruruxipore-rofexuvopipo-vuripid-jinomejiregofar.pdfIn PDF document text
    • http://files.bbhpsocouncil.org/uploads/1/3/2/6/132681882/jawuwubepojagek.pdfIn PDF document text
    • http://mubakiti.laracuisine.com/uploads/1/3/1/3/131379578/xisasegulapizim_zabunoso.pdfIn PDF document text
    • https://site-1038572.mozfiles.com/files/1038572/28506828252.pdfIn PDF document text
    • https://site-1039907.mozfiles.com/files/1039907/8192482200.pdfIn PDF document text
    • https://site-1037071.mozfiles.com/files/1037071/jojafavimobexo.pdfIn PDF document text
    • https://site-1036838.mozfiles.com/files/1036838/veketumusipejokivuti.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/810f040e-ea4f-4d13-b68b-cee5fc73efa3/kokanod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c210107c-1a69-4927-9ed9-a5ef40d938e0/18262108305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef900f1-f588-4948-b90d-e8e2ed4677fc/diduwaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8929/8076/files/lutolebuwafiwesumumofi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7909/7248/files/country_couples_dances.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7404/3038/files/68942315571.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4969/7959/files/who_invented_scientific_pitch_notation.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_off000074a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A9 5776 bytes
SHA-256: f937aa03f470843f6fa06e0e7b4e3e6d54843265e8a38861c58e38e3c83a9607
font_01_sfnt_off00008824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8824 16444 bytes
SHA-256: 4d3ab8ecbd424cfa65957d2e9d013e95b2dececb9c4ff14e3e0a65888cee6e00

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