Malicious PDF — malware analysis report

Static analysis result for SHA-256 39742bdffdffa146…

MALICIOUS

PDF

40.6 KB Created: 2020-10-07 18:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: e377cbaeefc8ae6e6fc02ceda6a4e408 SHA-1: 7547f51cbc72f767546dd666bf154aed7b6b2b9e SHA-256: 39742bdffdffa14600822fb94bc469089dcfc629756c78b49397ec62aa67964d
224 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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=introduction+to+pragmatics+birner+pd In PDF document text
    • http://files.one-now.com/uploads/1/3/0/7/130775727/fopeguw-nulekom-gumivixo-mofamubutixor.pdfIn PDF document text
    • http://files.centerviewfoodallergymanagement.com/uploads/1/3/1/4/131438202/5e3fe9ea7b5af.pdfIn PDF document text
    • http://files.wazzuor.com/uploads/1/3/1/4/131438310/37b82bf58659fb.pdfIn PDF document text
    • http://sojod.twyfi.org/uploads/1/3/0/9/130969772/sexat.pdfIn PDF document text
    • https://site-1036840.mozfiles.com/files/1036840/lopenobemowufogegura.pdfIn PDF document text
    • https://site-1037899.mozfiles.com/files/1037899/japasijem.pdfIn PDF document text
    • https://site-1036805.mozfiles.com/files/1036805/nobakutili.pdfIn PDF document text
    • https://site-1037086.mozfiles.com/files/1037086/bagaturagedibe.pdfIn PDF document text
    • http://files.inside-osijek.com/uploads/1/3/2/8/132815175/8f0ce1b3.pdfIn PDF document text
    • http://nezatexem.fourcornerstack.com/uploads/1/3/1/3/131382243/4b77201341f.pdfIn PDF document text
    • http://roser.insightcounsellingtoronto.com/uploads/1/3/1/4/131414661/boregetunajilulod.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/1/0427/9376/2975/files/the_little_prince_book_download.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_off00006119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6119 5436 bytes
SHA-256: 6ee3ce143b12b447bd1289847b151722e53ee046f641ff48a746472f3898ab55
font_01_sfnt_off00007377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7377 10108 bytes
SHA-256: 95cb7c554abd041b198ac69521debab43126e600dc4596e92c88a4c0822fb633