Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a6ed7fdc841b8e…

MALICIOUS

PDF

48.8 KB Created: 2020-10-03 02:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 78aecf68e751a1dd55af34e5b17b588a SHA-1: 2c3519f86003abd2b1f9bdaf94b656589c1bbfca SHA-256: 20a6ed7fdc841b8e4240d31c92416be74f537f681ba0ccee001ec0364d2e2262
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ancient+history+notes+by+vision+ias+in+hindi In PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/pepakisuwu.pdfIn PDF document text
    • https://site-1037077.mozfiles.com/files/1037077/95607551697.pdfIn PDF document text
    • https://site-1039621.mozfiles.com/files/1039621/lutepod.pdfIn PDF document text
    • https://site-1039140.mozfiles.com/files/1039140/53663076017.pdfIn PDF document text
    • http://wifazag.beespiderfree.com/uploads/1/3/0/7/130739625/nivupowelimeme.pdfIn PDF document text
    • http://files.teaysvalleyfire.com/uploads/1/3/1/4/131406086/e9a0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc51ec32-572a-4bf6-8062-fc03913cefeb/jimatez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f560b4b-1e87-433a-ac41-1bb65d17d9f1/kebuzilikalikapisikonabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567aaf3e-f31a-4ab7-8b51-000488a8feef/54957827185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467a5cb9-c9fd-49b6-ac09-b63329bfd20b/gagixazikobunaraze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da26145c-728a-4766-9c5c-51344b2602d1/fodopimeraki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774e172f-991c-4ac2-a873-011f37e1e17a/laninopogezuworupamiwelig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBB 5284 bytes
SHA-256: a6f4735e7241d8ded8be9e3433b1febd31c0f1460dab6ef5ec8c12b069b309b6
font_01_sfnt_off000070b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B9 10308 bytes
SHA-256: 80f959471b3e554528d16d6e9527d2d1d3d02ec877b76b6f8eff42b57dd257eb
font_02_sfnt_off0000943b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x943B 10740 bytes
SHA-256: 7f36e50882af72c9cce080aaa4a42ef2083f880b8092ea4c66b298e19a7ab993

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