Malicious PDF — malware analysis report

Static analysis result for SHA-256 873244bf376f3058…

MALICIOUS

PDF

34.8 KB Created: 2020-10-08 16:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 01a86016298faa6fbccbf4b97de9fc93 SHA-1: 32fb6d1f82bc10032c37f01eaddc30f1e5ef4b5e SHA-256: 873244bf376f3058638a8c62950958a7ba22a368d1ef1b1c6621d2d11d309839
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://gettraff.ru/strik?keyword=aptoide+minecraft+pe+0.+14.+0 In PDF document text
    • https://site-1038505.mozfiles.com/files/1038505/luvex.pdfIn PDF document text
    • https://site-1040250.mozfiles.com/files/1040250/24051251853.pdfIn PDF document text
    • https://site-1037850.mozfiles.com/files/1037850/62557290671.pdfIn PDF document text
    • https://site-1042185.mozfiles.com/files/1042185/bedabuwitizasotejogi.pdfIn PDF document text
    • http://files.campbellmosspto.com/uploads/1/3/2/6/132695663/jawiteva.pdfIn PDF document text
    • http://rutegab.southabfootball.ca/uploads/1/3/1/3/131379724/4905bab2cf5.pdfIn PDF document text
    • http://fepuni.smc-gpaa.com/uploads/1/3/1/1/131164269/gesuranubaj_demix_dajelevofutig.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/1/0433/8787/9587/files/wewevipebor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9175/8756/files/eso_scalebreaker_patch_notes_xbox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/honors_biology_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4556/3815/files/weight_watchers_digital_scale_battery.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7474/8057/files/physical_science_interactive_textbook_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/7194/7161/files/server_execution_failed_windows_7_photo_viewer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7400/5408/files/64877434503.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0924/4823/files/scuba_suit_ark.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9628/4062/files/sojosodufi.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_off00004b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B36 5392 bytes
SHA-256: f0b3238cd46d225e8fd559a827317bd9bf3fe97f4d7873ec0ba3bdc74a79314d
font_01_sfnt_off00005d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D87 9524 bytes
SHA-256: 3371401d91c3d47d226acaf18869184bb87faf4b4935502b56b9d428e7d83dfe

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