Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf78bb08300e90b1…

MALICIOUS

PDF

41.1 KB Created: 2020-11-02 02:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: a532a8ab8142c1a7c277feb51857fd26 SHA-1: ce7ea1ebeedd9444db944c2e13481ec20771533d SHA-256: bf78bb08300e90b11259fe86505140671fdaa74f3ebd24f698560fdccb66ea64
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=whack+the+teacher+poki In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_5f9bf33964863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5f99f7b54fc93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f87fd7588917.pdfIn PDF document text
    • https://sijipovaxeku.weebly.com/uploads/1/3/4/3/134364773/9294223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f874b447f2ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/16710514199.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/fuzatasiduzutemakig.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/faxaxajomenamogirenij.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/strategic_benchmarking.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/is_a_human_somatic_cell_haploid_or_diploid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a42fc6a-c778-44aa-b607-f32beb7c343b/37870670816.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_off0000647a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647A 4888 bytes
SHA-256: 9c40f231e161e15d45ca90b336957d14e2104e69ce425ab6143e2751690a8430
font_01_sfnt_off00007524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7524 10292 bytes
SHA-256: 8273380e6c2fc905638f658ca6f7ee788417fc87ef9b368e7b178da6dfc8e233