Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c6a2e40c45bbc2…

MALICIOUS

PDF

34.6 KB Created: 2020-10-09 08:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 85d0e6cfcb0484191b2c57bd28780d7e SHA-1: 77ee10faafd24e2b0c5ef440501002beec3dadfa SHA-256: 81c6a2e40c45bbc2f8a23e3d28eae6a9b51118688b061de2dd293e46a278393c
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=nonlinear+functional+analysis+pdf In PDF document text
    • https://site-1039152.mozfiles.com/files/1039152/16261840970.pdfIn PDF document text
    • https://site-1041939.mozfiles.com/files/1041939/79874969033.pdfIn PDF document text
    • https://site-1036815.mozfiles.com/files/1036815/35404230197.pdfIn PDF document text
    • https://site-1039132.mozfiles.com/files/1039132/goderevexo.pdfIn PDF document text
    • http://files.abogadoslaboralistassuanzes.com/uploads/1/3/1/4/131409717/2b22fb10.pdfIn PDF document text
    • http://memebawa.rmc1studio.com/uploads/1/3/0/7/130776247/nuwenarogafaze.pdfIn PDF document text
    • http://pukex.apexmedicalgas.com/uploads/1/3/2/3/132302780/9654655.pdfIn PDF document text
    • http://pupogo.byrdcreekcoffee.com/uploads/1/3/1/3/131379256/mosazujilivuwag-benesoluv-pumoxeroxojig-wesisixipozaraw.pdfIn PDF document text
    • http://gudewuni.mrlockettsmathsapps.com/uploads/1/3/0/7/130740522/7055602.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/1/0431/3861/3415/files/46841780991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/8287/0684/files/tuwizetiziwikivo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8159/7597/files/xuzuzixubetarak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7959/7213/files/betugadokupufupofilatad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6681/4375/files/ponenuroxigatizexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2179/3942/files/xopepusezokifalabafuwogun.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_off00004bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC8 5220 bytes
SHA-256: 04fcac13331b0d276cda7b89e35dff81cc7250e74098e22e2324cb57c3906d19
font_01_sfnt_off00005dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAC 9324 bytes
SHA-256: 0885cbdca2e8b0a2c645e0719b79188f609a26b40d458815150d5f18641b4c81

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