Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d20e15eb06c9f7…

MALICIOUS

PDF

33.0 KB Created: 2020-10-07 01:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c9b7a47c55bbfe7cf8ba29f027fc81b3 SHA-1: 8131d454d06e71685139a1710c334128fa2a9c4c SHA-256: 50d20e15eb06c9f72052d22f2f584467ccd6fc5d34c9f4aaf4fc2123a9a81622
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?keyword=raw+pics+io'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to obscure the final malicious destination.

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://cctraff.ru/strik?keyword=raw+pics+io In PDF document text
    • https://site-1039618.mozfiles.com/files/1039618/wakisufogeta.pdfIn PDF document text
    • https://site-1038808.mozfiles.com/files/1038808/ronapedufam.pdfIn PDF document text
    • https://site-1036796.mozfiles.com/files/1036796/zapigizotaw.pdfIn PDF document text
    • https://site-1038974.mozfiles.com/files/1038974/29663589238.pdfIn PDF document text
    • https://site-1043128.mozfiles.com/files/1043128/pakubuzenimonumebazi.pdfIn PDF document text
    • http://files.mchslibrary.org/uploads/1/3/0/8/130874490/774776.pdfIn PDF document text
    • http://files.howardbands.com/uploads/1/3/0/7/130739898/zotalametusowufo.pdfIn PDF document text
    • http://files.dkgalphachapter.com/uploads/1/3/1/4/131482887/nefof_difojokemeforer_jivuxaduzapaf.pdfIn PDF document text
    • http://nazoke.stanleyferrymarina.com/uploads/1/3/1/3/131398430/tekijojefumujole.pdfIn PDF document text
    • http://files.crossroadsmotors.us/uploads/1/3/0/7/130739472/8218350.pdfIn PDF document text
    • http://lalab.southislandecebc.com/uploads/1/3/0/8/130813042/tukope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8293/5189/files/unblocked_games_bowman.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4109/5834/files/53662938817.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6989/8903/files/gravel_pad_shed_foundation.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_off00004497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4497 4896 bytes
SHA-256: 41772b290b1b4ce5f25bd69d5454f24181b81c69854aa16fcc6a1df4b26ab973
font_01_sfnt_off00005571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5571 10100 bytes
SHA-256: b5af5d346d30b6bd74d68e31184687ff2fe23ca3f48f42a68c3009f16d1ae22f

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