Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4774ffc164f8ed9…

MALICIOUS

PDF

44.4 KB Created: 2020-09-29 22:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b2d0dafe71b9c6734d80daeba9bf100b SHA-1: 60f84d1fb69a56ee20d50518a78e1f5f77f39503 SHA-256: b4774ffc164f8ed91af1ea4db5164c28922c11450ff3d1d5bc52616eb9ab2384
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://gettraff.ru/strik?keyword=pdf+files+download+search In PDF document text
    • http://waduz.hthpta.com/uploads/1/3/2/7/132740750/fabiraxufebu.pdfIn PDF document text
    • http://files.mysamcooke.com/uploads/1/3/1/0/131070301/d6a8b957f2564.pdfIn PDF document text
    • http://files.kingfisherpbs.org/uploads/1/3/0/9/130969452/jejosetopivurup.pdfIn PDF document text
    • http://files.timcycyota.com/uploads/1/3/1/6/131637649/nugijedilotunulaxi.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/cc5e5950-b05d-475c-a9d6-70521456fc29/roguwowarenewotemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2077c8-b0b6-4dfd-847c-ce03746afafb/woruvumud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba5b583-8960-496f-8c90-6f3b8e3c3155/89475276391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5edd4c98-99a1-4b01-a8f1-afd1287e4114/42685514443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1424d360-7d0a-4d63-8ec2-e0024f8cf8c1/patow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c0c4d9-e502-4f5a-9962-53bd3ea82d6b/lixasog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fe1c0e-c36d-4d47-bcb1-bae9d0c5575a/rabiraz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eebbf64-4212-448b-8dbb-6784fb76cd62/nejozizokulavuzovaxedef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20736687-3724-4f62-acd8-9d5702331e61/fegoxibedenulabax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfdd620-488e-4639-bb27-b2c48dfdde7e/51123461053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/id_channel_tv_guide_for_tonight.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2340/9057/files/falojotisux.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_off00006f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F99 5200 bytes
SHA-256: d83ce5db7198b91cb6a48d0e760051f6854ab9369a69356be5af2a62cd633df7
font_01_sfnt_off00008159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8159 10372 bytes
SHA-256: a9bc40aac51e46f0f251206b875f3d10a5118f5ce255bbad016fa73018bb7aca

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