Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6380b6ca45b688…

MALICIOUS

PDF

42.1 KB Created: 2020-10-31 03:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 3aa751e6605ddb5b5f942e2248ee8e5f SHA-1: 200ddf9e620c32ab0cbe67009aef139093912686 SHA-256: ef6380b6ca45b6888c4e830c5417c30c23831b5dc9cacf248efe28514f9aa571
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=research+paper+on+english+literature+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f880c49874c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5f91499b1029e.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/da50c7e0ec8f483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f8b281f426a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000669a.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000669a.bin)
    • https://s3.amazonaws.com/henghuili-files/kizezofebolorabajokofiso.pdfIn PDF document text
    • https://s3.amazonaws.com/bunobu/northern_short-tailed_shrew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0370/6006/files/88366711526.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/spanish_grammar_book_with_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/international_macroeconomics_feenstra_4th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/48159698911.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/tetinuwuza.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/tujawexoretawebolibifor.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/29818706043.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 extracted file (font_00_sfnt_off0000669a.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000669a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x669A 5424 bytes
SHA-256: 592a6c0002a628da2c3ddfccd26008bef35dc7ee550bc5c73e08d0f5251cff0b
font_01_sfnt_off00007911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7911 10040 bytes
SHA-256: df7638acda8af4e25751bd5630f55495b6672d7c7b73425b4a5c304b8926596d