Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8136e4bd9f2eda3…

MALICIOUS

PDF

63.3 KB Created: 2020-10-28 04:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: fdc6a3b177378921cc2013e0f04c2abf SHA-1: 56bd3fa08af0ca298f7609adc7756bc9e9e8955a SHA-256: f8136e4bd9f2eda3b713875b5dd0d818689d1aee1b702bf52e30379a9925637f
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://cctraff.ru/strik?keyword=lesson+4+homework+practice+circumference+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_5f98c2c47519c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f8d97b208d43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5f8d5bb800eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f92a4fb8cd08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f870cdb54164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5f94fbd981d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5f903b7d7a8c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f86fa8d02859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5f935a353bf0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f89c1ce53dcc.pdfIn PDF document text
    • http://centre-blannaves.frIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000a5df.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000a5df.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off0000df6d.bin)
    • https://s3.amazonaws.com/buganabowumujef/best_to_word_document_converter_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/pitarapodelumizev.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/bitcoin_mining_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/lulixadopok.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/3827289801.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7616/9109/files/21832356209.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1137/4230/files/the_family_guide_to_homeopathy_alain_horvilleur.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_off0000a5df.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5DF 5392 bytes
SHA-256: b3663b192850b1c205b80c52a194fff7a2804483bc39d154c79ff123aeb3ddd9
font_01_sfnt_off0000b820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB820 11536 bytes
SHA-256: 5064c350b753fb9d14244d3665669cfb24077aac77ee97b3734f72dc82601cf3
font_02_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230