Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec36b9e9764ce3a…

MALICIOUS

PDF

46.2 KB Created: 2020-11-01 09:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: ee13353080e993341a1546ab04bd4b00 SHA-1: 064aacae1c259637e7485993eb3f550fcd3119fc SHA-256: fec36b9e9764ce3add9e52d8ea560846f13306bbf60eb1014145cc705ba80924
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/aws?keyword=bradford+exchange+free+catalog+request In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5f8ec35623b50.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/3398c8801.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/duwefevipumijavud.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/matlab_data_acquisition_toolbox_user_s_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000666b.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000666b.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off00009df2.bin)
    • https://cdn.shopify.com/s/files/1/0508/1779/4231/files/addison_wesley_geometry_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6847/1445/files/ray_bradbury_science_fiction_short_stories.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/5236/9595/files/honesty_billy_joel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6388/9060/files/kitorolilomowodu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1977/8233/files/hay_day_hack_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3977/1802/files/jusilaridodidigakomif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8463/6320/files/96209020270.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0578/8327/files/poodle_mix_puppies_for_sale_florida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/heros_journey_stages.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_off0000666b.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000666b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666B 5360 bytes
SHA-256: 8af028bb6d335fe5e8c3c5aa94392e2c7de476895e33453af3a2ecc6ecaf54da
font_01_sfnt_off0000789a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x789A 11044 bytes
SHA-256: 1ed0bd0d332cc3579162bf4aed3a64bf7e5c53ace96cf8e02a893cd21335ad56
font_02_sfnt_off00009df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DF2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71