Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f7f633655d74e8…

MALICIOUS

PDF

152.4 KB Created: 2020-10-12 10:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 78ca8c41901ce5d0f1873c2c5eea6db9 SHA-1: 40e69e6e0c8ff69d716a0f60207bce467f07a495 SHA-256: 15f7f633655d74e82f66f138ed73c64cec05e29d38f88bcf3a6962d45fa440a5
132 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=l2+mundial+interlude'. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it functions as a link farm on disposable hosting. The document body, though heavily obfuscated, contains a reference to the same malicious URL, suggesting the primary purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=l2+mundial+interlude In PDF document text
    • http://files.camocarriers.com/uploads/1/3/0/7/130775729/51cc2bfe015c90.pdfIn PDF document text
    • http://zijuxo.thealignexperience.com/uploads/1/3/0/8/130814328/woterarenutesod-buwawunasegam-videsaketiza.pdfIn PDF document text
    • http://files.tayloreddesign.com/uploads/1/3/0/7/130776590/mibojisatixo_rabedinedos_natisutada_wolotoluputabaf.pdfIn PDF document text
    • http://files.professorzahi.com/uploads/1/3/0/8/130814636/zituteziduvojog.pdfIn PDF document text
    • https://site-1036640.mozfiles.com/files/1036640/3323771697.pdfIn PDF document text
    • https://site-1039163.mozfiles.com/files/1039163/14919929712.pdfIn PDF document text
    • https://site-1039140.mozfiles.com/files/1039140/95902562374.pdfIn PDF document text
    • https://site-1040050.mozfiles.com/files/1040050/62122264399.pdfIn PDF document text
    • https://site-1041499.mozfiles.com/files/1041499/15547644028.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/1/0433/5940/4191/files/68269016181.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/best_mystery_box_dark_web.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7431/4946/files/gomob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2083/1904/files/wuzixeropekupidesisaleb.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_off00020579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20579 4640 bytes
SHA-256: dda199cb2e440a90aee95b48cde92c0ae38971bb2348323adaf6382d190b216b
font_01_sfnt_off00021504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21504 16200 bytes
SHA-256: a3301141ec92e95a02ac21f26b8313695a3c16b2f7cc33c7a87a4483ecf5839a
font_02_sfnt_off00024659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24659 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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