Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac51a333e71c9eb…

MALICIOUS

PDF

59.1 KB Created: 2020-10-30 04:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: f8ff1527eea4ccb4f7faece3c4b39c6a SHA-1: 9b8657f07f0713cab8a5df06d5f07e55bde4641e SHA-256: bac51a333e71c9eb7214fc53f2d560ab651d2d9633b288280f4420d31395805b
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.cc/123?keyword=audio+unlimited+wireless+rock+speakers+manual In PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f96b5feea36f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8cab05784c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_5f9a13a416115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_5f9710a115f4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f90c1140fba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_5f9a256f7685e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5f9584662e8ef.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/mufodexij-bepafakinagusel-subutaritatuj-diwubozora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f910ef9c2e75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5f8bc72a2ebfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5f8ece7910139.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/bededuxotulapil/multivariate_data_analysis_joseph_f._hair.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/dave_brubeck_time_out.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/59100227393.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/rafoxixisotoradogov.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/mathematical_association_of_america_books.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92B3 5340 bytes
SHA-256: 3bd6575361c42fd70bf4318a4bbff789c7b299bdb89a3079e5860dc7cfdd64cd
font_01_sfnt_off0000a516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA516 5364 bytes
SHA-256: 240cca44e4b5680dd6f1af5462d158a71a59780856136090d584261deeb7ccf7
font_02_sfnt_off0000b74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74B 11936 bytes
SHA-256: 52cb2919bc0380e7ff2c3dd8bd0acfe2d17dbff71158f67cebaf3899b53b80f2

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