Malicious PDF — malware analysis report

Static analysis result for SHA-256 79252bffa7542012…

MALICIOUS

PDF

44.7 KB Created: 2020-10-01 14:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 7c9e2d8a77c3e52ef424f84845f75bdf SHA-1: 62c156405972222d43f389feadc0da73dcfc1cab SHA-256: 79252bffa7542012c3b0150e531adffa504d8f79793c45d4367c1195d53391da
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=pdf+to+word+editor+download In PDF document text
    • http://bidobuxus.peterandpaulapixie.com/uploads/1/3/1/4/131454215/kuduj-lumataw-wenuxewud-bofixev.pdfIn PDF document text
    • http://files.sweetsavannahs.com/uploads/1/3/0/7/130739624/fe8b7.pdfIn PDF document text
    • http://zomoxo.ridgecrestcontractors.com/uploads/1/3/0/8/130874600/lejeburubunuwutogaro.pdfIn PDF document text
    • http://suwijanit.protectkahoolaweohana.org/uploads/1/3/0/7/130775511/rukokare.pdfIn PDF document text
    • https://site-1037028.mozfiles.com/files/1037028/95196638263.pdfIn PDF document text
    • https://site-1036909.mozfiles.com/files/1036909/kuwar.pdfIn PDF document text
    • https://site-1036920.mozfiles.com/files/1036920/24815980269.pdfIn PDF document text
    • https://site-1037875.mozfiles.com/files/1037875/94070647834.pdfIn PDF document text
    • https://site-1038777.mozfiles.com/files/1038777/liwekuxuda.pdfIn PDF document text
    • https://site-1037237.mozfiles.com/files/1037237/keniroxugazoxudox.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/1/0435/8628/9832/files/volume_sphere_and_hemisphere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/togolekowosurebite.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/40474154353.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6649/7960/files/4196953032.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_off0000727d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x727D 4816 bytes
SHA-256: 536ff9ae0666217c350dadf4c198d31e8fd3da5e1f9910db624475659734155d
font_01_sfnt_off00008300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8300 10208 bytes
SHA-256: c6a498ba44cc1af29e2b96a5a58d6e1539ebc55188a491bba7df59abc9483d3e