Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fb31c478d173aa…

MALICIOUS

PDF

46.4 KB Created: 2020-10-25 07:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 470a81e56d2b3768b285b86152d952f7 SHA-1: f663644f86f420564cabadf166d8d3d6f0f786ba SHA-256: 78fb31c478d173aa0c3c1735a1f6946fd33463119faca68d005d5f91522b03df
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://ttraff.me/aws?keyword=si+joint+stretches+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5f8ee7836b930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5f8d5eca800a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006b35.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006b35.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off00009eb6.bin)
    • https://cdn.shopify.com/s/files/1/0499/3826/8318/files/the_sims_mobile_mod_android_republic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6325/3409/files/50408800238.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5973/5456/files/new_england_colonies_geography_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5650/3205/files/runazixexifide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9872/1442/files/becoming_a_teacher_through_action_research.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/nano_sim_card_template_a4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2831/8877/files/queen_of_air_and_darkness_ending.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/0551/7213/files/levels_of_government_in_india.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1868/8424/files/fejitozawof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/31622002761.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/4080/2469/files/fafegerobuzolepif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9523/7813/files/public_partnerships_attendant_application.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6923/3565/files/39286338954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5063/8755/files/vavoo_tv_apk_cracked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da77bc58-6faa-4a7d-b136-18de5ddf6d6c/robedurigulodet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e4b3cc-823f-4832-807d-9ff99f2b9136/87299592605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b75220-a8af-46c9-af9c-bd9a1bb0a16c/nugasone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e5079f-dcfc-4d9f-bf37-876665f036e2/merizemugawiditofanapelu.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 extracted file (font_00_sfnt_off00006b35.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B35 4968 bytes
SHA-256: 994d34a066106ac8a4b5049fa409fc991fc8734a3dd347966ef24dd568b7bcaa
font_01_sfnt_off00007c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0D 10184 bytes
SHA-256: 03485249b150423d3ca608857afe41effaeb763691cd5b6ed9a100c64e8a67ed
font_02_sfnt_off00009eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71