Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7c50b5e9eeabc1…

MALICIOUS

PDF

49.8 KB Created: 2020-10-19 10:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9f21f077de8f5b16bbac02ade8eee946 SHA-1: 309fa1052e56930b3be47ed545f062620af7aca6 SHA-256: cd7c50b5e9eeabc10332e65a8dc134b3590d385c68602c54dc47a70461089cbf
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=sstream+header+file+in+c In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f87dce5b2e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f8cf4e708e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5f8a5cc8b302e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f8b68e19f754.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff2ba7b-c0fb-412a-b1d5-c0aceef93b35/game_of_life_electronic_banking_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8304/5293/files/terrarium_tv_apk_ios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0602/7670/files/maybe_someday.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/7337347700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4492/8674/files/pathfinder_basic_rescue_honor_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7207/2096/files/18479238320.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4831/2217/files/16995678959.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/transmission_of_heat_ppt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9928/6429/files/how_many_pounds_of_crawfish_and_shrimp_per_person.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/57231038016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7364/1895/files/mexizobanina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2231/7728/files/download_pesawat_tempur_simulator_su25_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3179/6634/files/safotosoligigorojul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0711/3373/files/pokemon_mega_adventure_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/retropie_best_games_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9268/0611/files/50816256549.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_off00007ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB2 5364 bytes
SHA-256: dfe2008aaa8a13b61f2714161b9e2bd9cabb4a6a361281ff857647067f1532a9
font_01_sfnt_off00008cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB9 14552 bytes
SHA-256: c93e35c7ae517712c154f204a5ecf131e41129c4d72b67227ca80a6b802badd3

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