Malicious PDF — malware analysis report

Static analysis result for SHA-256 831747686ce56c5a…

MALICIOUS

PDF

53.3 KB Created: 2020-10-17 08:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b96b23f90fef4cc759ac5beabc215a36 SHA-1: f2c2d73a7562287901070009290c0c3b0b726219 SHA-256: 831747686ce56c5af1af8e6006ae825bf238ff19061b50dbd5d6957d1cc2b5f0
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://ttraff.link/123?keyword=top+android+mobile+phones+under+15000 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f886bdf48393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5f88f703c64a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f876589ea476.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/d96ddb407408.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/jasapusuwejatu.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/1/0477/9045/6991/files/walter_riso_libros_me_canse_de_ti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2060/5850/files/33_the_series_volume_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7398/2630/files/pusadazajirokafoximek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0279/6464/files/linekupikuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b05bc8-924f-4c39-a2dc-92f053c48d52/80789612435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4862bc57-a744-4b59-9ed9-c15ae6e0ef01/77987691717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715232a0-b6a3-41ab-8184-79af5a06028d/wopugovoxukulotaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ce9aeb-fc30-4bc3-ae01-1eee7295b4bd/perimetria_fisioterapia_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b3e5df-1533-41b9-8818-90f8e3cc29b3/jowujamatojanodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d040a745-e2b7-4346-9029-03133b32909c/17092583768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031752b4-417a-4a6b-970a-5e4f4494aed5/46454302051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1497/4363/files/71878121547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6498/6266/files/william_shakespeare_biography_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9359/9410/files/laxebonenapatibuxeko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2825/0276/files/muvariraxapute.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_off00008f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F44 5608 bytes
SHA-256: 0f85153677e89218b9b99f4e1f219a9f25203811536fc08216eacf95d313d2db
font_01_sfnt_off0000a220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA220 10976 bytes
SHA-256: 179ba90ad50d18881262e5ca3a19fcf7241f8c9a6e4d75433b7e6df0743cb9aa

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