Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af8870ee1f0a815…

MALICIOUS

PDF

51.5 KB Created: 2020-10-02 04:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: a2a174f01c5cff42121e4054925fdf0d SHA-1: 7d8907f53b7336b68ce875c21a029a4527cb5f67 SHA-256: 3af8870ee1f0a8153efa661097d863b3579cc0150078a8b1b234b075444de194
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=allegiant+pdf+book In PDF document text
    • https://site-1038837.mozfiles.com/files/1038837/15735315978.pdfIn PDF document text
    • https://site-1036728.mozfiles.com/files/1036728/28015709101.pdfIn PDF document text
    • https://site-1037184.mozfiles.com/files/1037184/68246889110.pdfIn PDF document text
    • https://site-1037057.mozfiles.com/files/1037057/muwuwenomatadaw.pdfIn PDF document text
    • https://site-1040561.mozfiles.com/files/1040561/faretisupiwuruwux.pdfIn PDF document text
    • http://files.golfinaround.org/uploads/1/3/2/7/132740552/diseposezor.pdfIn PDF document text
    • http://files.melonilab.org/uploads/1/3/1/1/131164275/pobakopukokesat.pdfIn PDF document text
    • http://vapigupi.saintgregorysileby.org/uploads/1/3/1/3/131380934/kotebogisarisaf-folijoma-rojugizaj.pdfIn PDF document text
    • http://files.csuwritingproject.net/uploads/1/3/1/8/131856602/leravitaf.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/1/0480/7108/2148/files/algebra_1_regents_august_2014_answers_jmap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/88870791860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/pusaruraxovurafezasoxiki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6703/1200/files/maplestory_ark_guide_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3963/2803/files/lds_12_step_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db99dc50-8b20-4a97-bbe6-676cc36cdb3b/sekupubovanezigeride.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_off00008b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6D 5128 bytes
SHA-256: 7f056bb926b9186207a2b107fd1f4b8836c0c003c2e6f746d8f17863b275dca3
font_01_sfnt_off00009cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CFA 10752 bytes
SHA-256: 47dcfdbe978a69798c561e1878d7e98c79220473d16ea08e89f237e8c0ededd1

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