Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee189b10687e557…

MALICIOUS

PDF

33.6 KB Created: 2020-10-04 00:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c733a8480380e11ead2b5c7698d0c22b SHA-1: adba00ea7d82e3d5ade474bb156abb0a0498a8fb SHA-256: 8ee189b10687e557067c1c08542cac4f46e2fe9db2471edfd6bc84871ab44e89
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though partially corrupted, includes the URL 'https://cctraff.ru/strik?keyword=mastering+microsoft+exchange+server+2016+pdf', indicating a lure to a malicious site. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the redirector infrastructure.

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=mastering+microsoft+exchange+server+2016+pdf In PDF document text
    • https://site-1039624.mozfiles.com/files/1039624/25853528861.pdfIn PDF document text
    • https://site-1040006.mozfiles.com/files/1040006/3226743357.pdfIn PDF document text
    • https://site-1036680.mozfiles.com/files/1036680/65526736997.pdfIn PDF document text
    • https://site-1037283.mozfiles.com/files/1037283/62244800485.pdfIn PDF document text
    • https://site-1039895.mozfiles.com/files/1039895/44487980068.pdfIn PDF document text
    • http://files.theces.org/uploads/1/3/1/3/131380625/b50e24.pdfIn PDF document text
    • http://jabakor.tulalipyouthservices.com/uploads/1/3/0/7/130739090/limis.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/1/0486/5966/0968/files/plug_in_power_meter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8561/7566/files/power_of_attorney_revocation_form_california.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_off000043ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43AB 6152 bytes
SHA-256: e2e62623bf886b8fa5150c058faf00751b3c6fe28baa380eac9bc9739d37721d
font_01_sfnt_off0000588d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x588D 9740 bytes
SHA-256: b202c6b9f1f806cd0d189a1c13acbe3d66f6f25d9c7629537ee513012e012fe2

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