Malicious PDF — malware analysis report

Static analysis result for SHA-256 4633b16383a99724…

MALICIOUS

PDF

57.5 KB Created: 2020-10-16 02:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 21323f458e4ea0c1c1c69977c4bb6ed4 SHA-1: bad51902e05e6924700195112d3212a32031d579 SHA-256: 4633b16383a997242dc1060d60d83f677f4ca6c3594492294791490f297842e9
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=encode+pdf+to+base64+js In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f8769a1a7318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f88b9c68fb31.pdfIn PDF document text
    • https://site-1041677.mozfiles.com/files/1041677/2779203875.pdfIn PDF document text
    • https://site-1043115.mozfiles.com/files/1043115/4286779097.pdfIn PDF document text
    • https://site-1038879.mozfiles.com/files/1038879/83641492228.pdfIn PDF document text
    • https://site-1042452.mozfiles.com/files/1042452/64160530453.pdfIn PDF document text
    • https://site-1039873.mozfiles.com/files/1039873/butomaj.pdfIn PDF document text
    • http://www.webtoolkit.info/In 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/1/0436/7751/5929/files/61521308305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8081/9881/files/sowovepevolukigera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8019/4459/files/tajegegozo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6371/7269/files/bezog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c740d8-c460-44a0-8a70-67dcd464d01c/76114679636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12eab8e-38d4-4c34-b4ff-30beea303db6/gofijoboxodufewog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3fdd44-ffe4-437e-98c7-2d4701afed28/vodirenupofonipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020d6a1a-76a6-449f-9088-2da6bb51516b/jowodaduze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422c626f-93d8-4e27-8ad6-0946084ab7df/sotapazovudivajemojozodik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23163621-cde1-47d7-92e6-5c7325fea454/nikejuwonuvawulus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b31389-1289-493d-b126-c6ad8bcbec6f/66864151150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7a8ac7-48a5-4633-bac6-9a7e8548ebcd/36871963848.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7788/8925/files/9619675051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5895/3881/files/android_barcode_scanner_to_pc_usb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1767/7211/files/suzevexewalerijoforobepaz.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_off000094b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B4 5436 bytes
SHA-256: e003aa6503c5b0ba424b0a542348f3215271fb72fd69bf2b02926122978788fb
font_01_sfnt_off0000a746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA746 15136 bytes
SHA-256: 3eb0a4996d0ca358018c1987bbc070ac4cbad131c465e7fd1693abf28e1c48b1