Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c08e3ec5a5d7456…

MALICIOUS

PDF

38.5 KB Created: 2020-10-25 19:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: c85f2f91f53335c0b09c653f2532d4a2 SHA-1: 1b146ed708a825dadcb2c177baa197f5632e90e7 SHA-256: 5c08e3ec5a5d74569db9b91ea5663f441b6712a2168f511876e7d618cbb71d5a
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=editing+pdf+text+box In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5f8c46ab675d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f906bc3037a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000058b9.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000058b9.bin)
    • https://cdn.shopify.com/s/files/1/0478/8446/8390/files/louvre_museum_audio_guide_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0040/3880/files/85883636214.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/possessive_nouns_worksheet_with_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/18444038285.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/16332851155.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/bobij.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/jilalaseta.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/milili.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/capacitor_run_induction_motor.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/53880480978.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3745/7575/files/king_of_camouflage_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4155/3046/files/67148210216.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3509/7770/files/demorgans_theorem_experiment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8723/1674/files/31493913118.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/playbook_barney_stinson_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/21178293590.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_off000058b9.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58B9 4860 bytes
SHA-256: 8c5e7abf988c17cccec58f9d93e328eecc1f188a22457670708f0f19cea1e231
font_01_sfnt_off0000695b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x695B 10532 bytes
SHA-256: 1493dd2bf9a7600a549f07fcccadeb0ceb6f19b3bbdcfd1545f13ac79289fe9b