Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d67e7378424bdfa…

MALICIOUS

PDF

41.2 KB Created: 2020-10-08 04:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e60a3a69c65f4f30850120cbffe3ffa0 SHA-1: f5073794a5094dd19b7b57c78cd1a964f1be9ac4 SHA-256: 1d67e7378424bdfac63dcceb8bfb6f9364f71833ead98114bdcce347d7370320
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to external PDF files. One URL, 'https://cctraff.ru/pify?keyword=sujeto+y+predicado+ejercicios', is identified as a malicious redirector. The document's structure and extensive link farm suggest it is designed to manipulate search engine results or lead users to malicious content, rather than providing legitimate information.

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/pify?keyword=sujeto+y+predicado+ejercicios In PDF document text
    • http://files.pflagdetroit.org/uploads/1/3/2/3/132303371/koribi-binixiboro-fexadifuvulagos-sisalavaj.pdfIn PDF document text
    • http://bisezog.calmquietspace.co.uk/uploads/1/3/2/8/132815028/5419581.pdfIn PDF document text
    • http://sawuli.flipconsultants.com/uploads/1/3/1/4/131456363/28ad24430c059.pdfIn PDF document text
    • http://nipunu.insideemilyshead.com/uploads/1/3/1/0/131070197/8474853.pdfIn PDF document text
    • http://fufovep.vvsalesteam.com/uploads/1/3/0/7/130739430/banuga-wapejemig-wuzewikipu-toleloxefabipo.pdfIn PDF document text
    • https://site-1036680.mozfiles.com/files/1036680/gepujuwu.pdfIn PDF document text
    • https://site-1038927.mozfiles.com/files/1038927/vojunoxanekabosejumak.pdfIn PDF document text
    • https://site-1036907.mozfiles.com/files/1036907/81945916272.pdfIn PDF document text
    • https://site-1037169.mozfiles.com/files/1037169/sonasigagowu.pdfIn PDF document text
    • http://pojaneve.adolfostreeservice.com/uploads/1/3/0/8/130814328/litegoz_bamiguli.pdfIn PDF document text
    • http://gujox.prrms.com/uploads/1/3/2/3/132303001/7575798.pdfIn PDF document text
    • http://files.theincomesnowball.com/uploads/1/3/0/8/130873961/8083128.pdfIn PDF document text
    • http://files.jamearichmondedwards.com/uploads/1/3/0/8/130814066/74bc3ebd2ffe43.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_off00006128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6128 5316 bytes
SHA-256: 2a2795808804d0fad6ef3815edb29cd4240fd91bf170e3a9747d885ff259728d
font_01_sfnt_off0000735a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x735A 10896 bytes
SHA-256: 93f54f164688e559c99a59952837bb1fa9fa6ec067901decd3e1fd75fa7fe3d4

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