Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cf04a2306ddd23…

MALICIOUS

PDF

39.0 KB Created: 2020-10-06 21:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 24d70e6e1b789c61297e17d4c39b68d4 SHA-1: 7a5eca746b44b0bd5565347290186e7817eac892 SHA-256: a3cf04a2306ddd239a14b923a708de6abf5b132d295cdbf4fb300272c024d9fb
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=ryanair+boarding+pass+pdf In PDF document text
    • http://files.healthhazardsofhomosexuality.info/uploads/1/3/1/4/131406140/a650c54f04de.pdfIn PDF document text
    • http://files.thecourageousstepsproject.org/uploads/1/3/0/7/130775242/a1df2c4530625.pdfIn PDF document text
    • http://jeloxof.southsidecigars.com/uploads/1/3/1/6/131606289/dipanasoruginuje.pdfIn PDF document text
    • http://files.wellingtonstreetartgallery.ca/uploads/1/3/2/7/132741593/fcd18133cf28.pdfIn PDF document text
    • http://files.lifespacedesigns.com/uploads/1/3/1/1/131163601/124452.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/1/0432/7853/2761/files/ark_basic_kibble_dinos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2667/3575/files/piano_for_dummies_2nd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8788/3165/files/oxo_timer_instruction_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6238/1729/files/febenuxavinujilulab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4906/9991/files/air_transportation_a_management_perspective.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3078/4411/files/darwin_natural_selection_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8931/7025/files/begademaved.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0587/6123/files/25554891052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8052/3681/files/18441620591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2400/9381/files/evolution_of_zoos_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/jelikivonej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/zipom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1681/3735/files/rupewiki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/97518963803.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_off000059d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59D1 5424 bytes
SHA-256: 47e109aff24a2fc3117cf6874a6b7a01527232d8bf0ec9172f6d955f2eff9f42
font_01_sfnt_off00006c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5E 10120 bytes
SHA-256: 9f119d8b6215cf3ed8ac126cd1417ea23e2d10742b26914f26bc1f4e33d5f4a9

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