Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb7cef50d2dec39…

MALICIOUS

PDF

34.5 KB Created: 2020-10-09 17:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 60987561eb5610f56337ab9c773c9960 SHA-1: d638fb9e39a37a98988b3e14d4a31f796deaa9c7 SHA-256: 3cb7cef50d2dec3938ff989fc545adcffd7919df56687fb31606b4871e4bec45
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=aaa+redwood+city In PDF document text
    • http://filosabip.heidireneeaijala.com/uploads/1/3/0/7/130776716/092994b03f2a6.pdfIn PDF document text
    • http://files.hermeierdoodles.com/uploads/1/3/1/0/131070625/xatezijusawet_piwutaredusene_mazazoj_lejol.pdfIn PDF document text
    • http://files.dojochattanooga.com/uploads/1/3/0/7/130739744/2124020.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/1/0438/6285/1749/files/87606193502.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8711/2613/files/davivienda_costa_rica_empleo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0632/7975/files/the_blue_danube_waltz_in_movies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/aztec_war_shield_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5727/4261/files/the_leader_ionesco.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/deductive_reasoning_geometry_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2546/3968/files/zetaclear_walmart_price_match.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f059f3d2-ca4a-43d5-b14f-47cbb936e98f/suwolab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaca62fd-7286-43b3-8231-0456b10b2d05/86355691730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3166e38-69f3-4e77-8049-507efa87c57e/kibejeburuxagijog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b58ef11-b20a-467e-8245-55f67ac0da1b/ponakotibomovikew.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_off00004a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A24 4908 bytes
SHA-256: 5519028f1fece481f99addf226c67bb89a0f932701d9eb5f7a42f1c18861cc63
font_01_sfnt_off00005afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFA 10088 bytes
SHA-256: 071271d9d3e2cefdc8a02b7a82132471678d18457e42fdb3cabfcf45c62431d4

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