Malicious PDF — malware analysis report

Static analysis result for SHA-256 045a87cf45b89d6b…

MALICIOUS

PDF

71.9 KB Created: 2020-10-05 04:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c52ebdef522a97e1bd2ff9e7b0811504 SHA-1: cf6e92efefc2d2966829e6b9fc892a21c095e4b7 SHA-256: 045a87cf45b89d6b8793aa001e06b4d2366cf3c510a25ee3d41d557822ee2cb7
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=abdullah+%25C3%25B6calan+kitaplar%25C4%25B1+pdf In PDF document text
    • http://totofu.mirchaiya.com/uploads/1/3/0/9/130969937/1941015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38cbef04-1f5f-4be5-8c6e-1052ae9a7fc7/10527242652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa62b00d-156b-4744-b45a-830d988362d3/xuwofiwukefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7092ea0-31ee-4151-9220-78b9a08b7d4e/1041612024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d42d98a-2801-4381-a7c9-09052dc91dc8/19335721618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8c187a-c9de-4a8e-ae6c-857180d0ecb7/59401801301.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5209/5898/files/27394817399.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4774/6726/files/98124119689.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9072/2472/files/activity_2.1.1_centroids.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1478/5704/files/notice_of_intent_to_impeach_minnesota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9967/5041/files/xufarerimefena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8286/1729/files/12017339656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4481/3470/files/tristan_evans_the_vamps.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5300/2139/files/heritage_high_school_basketball_newport_news.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/jisajeralakamabozutezomed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3664/1960/files/darnified_ui_new_vegas_nexus.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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 5428 bytes
SHA-256: 7d89d6115eb94115437d4b4604d7bb7ce0a631d19fa50d7bedd8ec5906d9c371
font_01_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 12272 bytes
SHA-256: 5797399d592df2436121911abe6d2f99c6c0b6edf44c48f6a6ff0b26ed8b77eb

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