Malicious PDF — malware analysis report

Static analysis result for SHA-256 323d4524e125ccbe…

MALICIOUS

PDF

33.6 KB Created: 2020-10-12 00:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8fdff1ff57eacd7625f508df301364bb SHA-1: f44ef311a5d80fe0cd01d0d0f724c7e283008da5 SHA-256: 323d4524e125ccbe42112e00063f8f72087941b8050262481902f1ac360c9438
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure. The primary URL, https://cctraff.ru/strik?keyword=the+complete+guide+to+the+toefl+test, is flagged as a malicious redirector. This suggests the document is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 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.
  • 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=the+complete+guide+to+the+toefl+test In PDF document text
    • http://mozexo.stonefoxfeather.com/uploads/1/3/2/6/132695399/6167760.pdfIn PDF document text
    • http://files.mshamsi.com/uploads/1/3/0/8/130813755/jabadanebamigof_rudugevidow_farevozisa.pdfIn PDF document text
    • http://files.partoencasamujeressabias.com/uploads/1/3/2/6/132683014/vigavo.pdfIn PDF document text
    • http://files.auntysueskitchen.com/uploads/1/3/1/6/131607522/tavojiwurofi_limetutufo_fumodotaj_defamowilut.pdfIn PDF document text
    • http://files.ipersian.org/uploads/1/3/1/4/131453665/wizexoki_sagajuze_ramozopunu.pdfIn PDF document text
    • https://site-1044164.mozfiles.com/files/1044164/86353106398.pdfIn PDF document text
    • https://site-1043536.mozfiles.com/files/1043536/falotubojogotipoli.pdfIn PDF document text
    • https://site-1041090.mozfiles.com/files/1041090/86491119186.pdfIn PDF document text
    • https://site-1038867.mozfiles.com/files/1038867/86160691658.pdfIn PDF document text
    • https://site-1039811.mozfiles.com/files/1039811/26028521067.pdfIn PDF document text
    • https://site-1042199.mozfiles.com/files/1042199/givanabu.pdfIn PDF document text
    • https://site-1037077.mozfiles.com/files/1037077/89158542019.pdfIn PDF document text
    • https://site-1041579.mozfiles.com/files/1041579/tuxaguvogewawomixolidurej.pdfIn PDF document text
    • https://site-1038490.mozfiles.com/files/1038490/41054629920.pdfIn PDF document text
    • https://site-1038782.mozfiles.com/files/1038782/20593360722.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000045e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45E3 5212 bytes
SHA-256: 29caade14bc8dc73d32e63dc1eb5d0839821320a9d034c41ce8e670244279450
font_01_sfnt_off00005788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5788 10080 bytes
SHA-256: 86b68f338c50f775d047dcd55ea022b1520df2db4f9f8daf21318385fda7021d

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