Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a8060255cd1683…

MALICIOUS

PDF

44.3 KB Created: 2020-10-02 01:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 19c37d3cef184567d5d70ea5284b6d71 SHA-1: 4e8e03457b4acc6729b609bf57e0da1618cb3804 SHA-256: 52a8060255cd1683f0b9a17b5e4003266eecb16c3242d5ede1e0588959e0a346
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://cctraff.ru/strik?keyword=fluid+simulation+android+github In PDF document text
    • https://site-1038390.mozfiles.com/files/1038390/nofobuven.pdfIn PDF document text
    • https://site-1037061.mozfiles.com/files/1037061/jomopazinotib.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/83172663828.pdfIn PDF document text
    • https://site-1037166.mozfiles.com/files/1037166/217125692.pdfIn PDF document text
    • http://bifewupa.desertbeagle.com.au/uploads/1/3/1/0/131070588/wamodifuleter_wumon_zukura.pdfIn PDF document text
    • http://rigapekep.emmadcohen.com/uploads/1/3/1/3/131380429/xomakugilufi.pdfIn PDF document text
    • http://files.seekadventuremedia.com/uploads/1/3/2/7/132740412/0a9de34c88aa.pdfIn PDF document text
    • http://mudigumit.adpecuador.com/uploads/1/3/2/6/132695213/b92f6e6371e65c0.pdfIn PDF document text
    • http://files.katherinemayleon.com/uploads/1/3/0/7/130739517/1648496.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/1/0482/9331/4722/files/54330547217.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3069/1496/files/1765743545.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7073/7570/files/pixel_car_racer_mod_apk_v1.1.80.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8047/2983/files/how_can_i_improve_my_english_speaking.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/75882245624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8452/4949/files/congruence_and_similarity_worksheet_grade_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6955/4329/files/google_forms_logo.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_off00006fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD9 5332 bytes
SHA-256: 43b767a94f960bd672066919a62c9368d25fc6e8b9cf9f722e3b3c09edb07515
font_01_sfnt_off000081c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C6 10184 bytes
SHA-256: a08f9124df68c804fb06af6e91a5838f1ca7ce364f56ebde878503449037e988

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