Malicious PDF — malware analysis report

Static analysis result for SHA-256 4548efaefddde6a3…

MALICIOUS

PDF

43.3 KB Created: 2020-10-08 10:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 549944f1b8d27638a9e12e0e4a38b8cb SHA-1: 6a3ff0d2e26537d71c4bbf8a847490e00eab2bc7 SHA-256: 4548efaefddde6a36859082da6bb67eef295c4611b786f820ae55a8e10d9d21e
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://ggtraff.ru/strik?keyword=how+to+convert+many+pdfs+into+one+pdf In PDF document text
    • http://kixofuxe.mosaico.ch/uploads/1/3/1/4/131407588/e576c50bab1b1f.pdfIn PDF document text
    • http://files.keyspeechtherapy.com/uploads/1/3/0/7/130775056/47ee3f35f.pdfIn PDF document text
    • http://files.hwy21rvparkandstorage.com/uploads/1/3/1/4/131436966/sudisovobak.pdfIn PDF document text
    • http://files.mccoolauctions.net/uploads/1/3/1/4/131437380/fanabefofuxivuk-mimapibuzov-zinibojenisa-sodidiw.pdfIn PDF document text
    • http://files.granitepeaklaw.com/uploads/1/3/1/3/131381850/14e5ee18.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/1/0482/1555/6250/files/47468270832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/2988/0981/files/66126569550.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7952/3240/files/xukejowutevekiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4749/3536/files/61426812971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/4223/3509/files/arduino_lcd_projects_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0790/9794/files/nukelawus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6654/6583/files/7.1_home_theater_system_amplifier.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7155/3188/files/shih_tzu_maltese_mix_puppies_for_sale_in_az.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3267/7022/files/leighton_meester_height_weight_measurements.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3224/7445/files/lifetime_fitness_beachwood_jobs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/tcp_ip_book_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/the_giver_chapter_17_questions_and_answers.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_off000068eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EB 5484 bytes
SHA-256: 16dd01abb845415dd011c0255f56330d75a18bf8ef8f81de9ab0377b68c92762
font_01_sfnt_off00007b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B99 10600 bytes
SHA-256: 78021d4ef5c00bf8e4f2ffe7f1931a92fdd4eab41ab0ec722225a87166079f69

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