Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bace6c49d87890c…

MALICIOUS

PDF

54.0 KB Created: 2020-09-30 18:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c8b90a3cafe40f26f58bbce38a780537 SHA-1: 545be7f7dd49ae69b9de2741426bb55fc4f35752 SHA-256: 0bace6c49d87890cd4dd6a4e8fb2466c2131672a259303a1dbb2c3162b724bd5
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=define+phonology+pdf In PDF document text
    • http://files.redsquirrelconservation.ca/uploads/1/3/2/6/132695492/tuwesarevelik.pdfIn PDF document text
    • http://files.davidmichaeldesign.com/uploads/1/3/1/6/131636766/3ab714.pdfIn PDF document text
    • http://ronenuxi.unsealedtruths.com/uploads/1/3/0/7/130775537/gunikawu.pdfIn PDF document text
    • https://site-1036884.mozfiles.com/files/1036884/gabudunuketagi.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/86022804164.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/89446698918.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/1/0438/8805/0328/files/mijujulivomefozawadomorix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2696/1816/files/five_ten_tennie_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2985/4368/files/guzajizirewafewum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2839/7727/files/heart_of_fear_raid_entrance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/pdf_to_dwg_converter_software_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5484/4054/files/fopanis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/bufufigurojetafugebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6815/3239/files/xumanajibutulozikukirixul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6080/4249/files/tibia_druid_leveling_guide_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/vowexude.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_off000090fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90FB 4920 bytes
SHA-256: 14c4f6d1159e04c5981bc719a0e2652c94afb994889837aa35ba35c663613555
font_01_sfnt_off0000a1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1CD 12088 bytes
SHA-256: 36d9cee4367a3e3a0a2fbac3552a1d3fed581d8d4fd989207a8e3f354de82bc6

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