Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae9e82194519427…

MALICIOUS

PDF

49.2 KB Created: 2020-10-05 22:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ab69e097b4abf8e313d29ce99490ae68 SHA-1: 74e0c69c29d2ac3d9374efa44319218f42188354 SHA-256: 5ae9e821945194276097f808b009deac4480cf0031a20bf177b5bf4438b70a55
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document's content, disguised as educational material, combined with the SEO-optimized URL, suggests a tactic to attract victims through search engines and lead them to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=producto+cruz+de+dos+vectores+ejercicios+resueltos In PDF document text
    • https://site-1044113.mozfiles.com/files/1044113/tutudepikosajo.pdfIn PDF document text
    • https://site-1036951.mozfiles.com/files/1036951/83154571402.pdfIn PDF document text
    • https://site-1042720.mozfiles.com/files/1042720/81580697874.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/bovukapubuvitugexatazazaw.pdfIn PDF document text
    • http://buxidix.dorothyfieldsart.com/uploads/1/3/0/7/130739164/vogosularipa.pdfIn PDF document text
    • https://site-1042590.mozfiles.com/files/1042590/42763978432.pdfIn PDF document text
    • https://site-1040358.mozfiles.com/files/1040358/gigasazimopuzeribileb.pdfIn PDF document text
    • http://files.bluekoicrafts.com/uploads/1/3/1/4/131453053/8f96c.pdfIn PDF document text
    • http://files.gogonailstore.com/uploads/1/3/0/7/130775513/4991196.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDE 4912 bytes
SHA-256: 5b6ade5471489150b1393092aa5ea26a5a765a737adaa8f4ba25090156c29d28
font_01_sfnt_off00006fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB0 2296 bytes
SHA-256: 5a317423ed59731892db7b43a240c358bbc6d8b5aa11a7983c2034cb9c01b636
font_02_sfnt_off000079a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A1 11604 bytes
SHA-256: f3d72f7282037351f06ffedc1617337e0059708f02c36cb7039b8c83c1b50410
font_03_sfnt_off00009f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F85 16388 bytes
SHA-256: 96d2bf60b230a6b87faacf7698ae3a3cd2863e8115d395288498d000fce2dd50

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