Malicious PDF — malware analysis report

Static analysis result for SHA-256 a239cd53cfbafdef…

MALICIOUS

PDF

59.4 KB Created: 2020-10-15 15:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: edf0ca1dafe543be90324e63928a9631 SHA-1: f2221301bb6f3817a323db7ee67f5a6cdfcb6de2 SHA-256: a239cd53cfbafdef45695aee3207e8b8a18603dd928e0ebe834c7b914cf08e6e
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, masquerading as a tutorial, which point to various external websites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one of these links directs to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent. The embedded links are likely intended to redirect users to phishing sites or download further malware.

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://gettraff.ru/123?keyword=python+gui+programming+tkinter+tutorial+pdf In PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/xepabix.pdfIn PDF document text
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/figabesesamanuxip.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/1883901.pdfIn PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/pakeburi-gujurobepo-fevinaf.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/8767144.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/tagedagol_wutagisut_wosedasikoji_puwumij.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/aa94aa7f99c.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/sixasunusimu_vezaninume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f87b04ff0020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f87f6c62bcb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f879d1f0f908.pdfIn PDF document text
    • https://site-1041591.mozfiles.com/files/1041591/nazifaniwadozaxogomodimix.pdfIn PDF document text
    • https://site-1038815.mozfiles.com/files/1038815/75870377439.pdfIn PDF document text
    • https://site-1038384.mozfiles.com/files/1038384/vukavozedamekagevar.pdfIn PDF document text
    • https://site-1048564.mozfiles.com/files/1048564/72251597501.pdfIn PDF document text
    • https://site-1039667.mozfiles.com/files/1039667/zobezebotiwavukasopejobe.pdfIn PDF document text
    • https://site-1037858.mozfiles.com/files/1037858/zirewiwus.pdfIn PDF document text
    • https://site-1040317.mozfiles.com/files/1040317/48976687867.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/1/0432/4347/1008/files/taming_of_the_shrew_summary_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1252/9587/files/canon_powershot_elph_100_hs_user_manual.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_off0000ab0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB0E 5444 bytes
SHA-256: b6d14be731b6e9dea04efa2fa86581885a3d37cbcc468ca0b7bc65c16ebcb446
font_01_sfnt_off0000bd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD71 10104 bytes
SHA-256: a4801237096c72dc15b67c062f2336939a7aea7cae27ff4fbe5baa1cb81224ac