Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c0a9feeb43dbb1…

MALICIOUS

PDF

41.4 KB Created: 2020-11-06 16:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 05afe11733857c9b1c09faa0695032bd SHA-1: 9fb1a8e9bb2f42b1a4723823c0e4f0e980a95981 SHA-256: a8c0a9feeb43dbb15439f35341df47a8bd0155831de3a33f6042cacb2502c82f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, identified as a link farm, with at least one pointing to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting an attempt to drive traffic to malicious sites, potentially 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=real+life+examples+of+functions+math In PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/mexufukuxu.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/6684621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5709ad-cddb-456f-bf90-7ba710509ec0/papamujujofizip.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/organic_chemistry_bsc_1st_year_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/sumerafarofazujogixo.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/xutarenuretadovap.pdfIn PDF document text
    • https://zusepofofone.files.wordpress.com/2020/11/zelatagapalezufopeze.pdfIn PDF document text
    • https://notazit.files.wordpress.com/2020/11/bmw_s1000rr_2020_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef0a0db-bb08-4a36-bcb6-8fb8915bd1a9/rugatujotipa.pdfIn PDF document text
    • https://pirurupi.files.wordpress.com/2020/11/fakaxajafadamotules.pdfIn PDF document text
    • https://juzikarew.files.wordpress.com/2020/11/64641752565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b551ce-29f7-4b4e-9345-aaba1db5081e/92693497674.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_off00006239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6239 5232 bytes
SHA-256: 6cf1e89658b9d1df65ba83b24943cb34bd59e1fa0bdf55f03f11f7f1b9ef0d88
font_01_sfnt_off000073f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73F5 10880 bytes
SHA-256: 131f96329f9ef515523583066786c42106533deecca4ea4648e3a392480b0987

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