Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df8d56efcb62ab7…

MALICIOUS

PDF

41.4 KB Created: 2020-11-02 00:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 8f9867004c8b153f7990a78c8d7beb37 SHA-1: 590deafd33be72405209518389dafb76c098fb70 SHA-256: 4df8d56efcb62ab7302213fb84d97e7d45b19b9de204b8f73b9362d1e1813aa7
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.me/123?keyword=2021+calendar+printable+word In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f87349b5aa75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5f99d47e72a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5f8c9e7566c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5f9c7f345f7a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f915c51c94e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_5f91d029a5064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5f8ad3c48a449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_5f9f3a7ef3c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_5f9beded4f429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_5f9c3dd68bbb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_5f9bef6b5d835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f95fb0b1ba71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381102/normal_5f9caed59e2e5.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/1/0507/3128/6724/files/nupumadomanosife.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/64909586869.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/dibinuforuxewenajeleba.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_off000062f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F1 5352 bytes
SHA-256: 4e7e4868101427193ac97d0fdfe33b420fe1d9c8136689ada8de35ec918553be
font_01_sfnt_off00007539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7539 10492 bytes
SHA-256: 6fc5c7b05b0b772c0e9729d57afc7cd4d8b866192741c8a1421de26969dfd86b