Malicious PDF — malware analysis report

Static analysis result for SHA-256 853f6fbd4f4fb10c…

MALICIOUS

PDF

64.3 KB Created: 2020-10-06 09:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 41b5729f5ba118cf3ac4db08269af9b0 SHA-1: 0c7350bedb8f4c882ec52e31d0722bf63655554d SHA-256: 853f6fbd4f4fb10c44b5927f1ecdf58ed1859f5b558debc8ee47e4b35ab09831
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://ttraff.me/pify?keyword=2017+bowman+draft+baseball+checklist In PDF document text
    • http://files.whizmeal.org/uploads/1/3/0/7/130776425/jegipoje.pdfIn PDF document text
    • http://files.sports-journalism.com/uploads/1/3/0/7/130739926/vuvudafufutu-refedir.pdfIn PDF document text
    • http://files.dogworksc2.com/uploads/1/3/0/8/130814729/4613e09450.pdfIn PDF document text
    • http://files.webloom.org/uploads/1/3/2/7/132710592/fofagajilivuge-diludamikovare.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/30cdf163-834a-4b38-8285-4d6bc92a1378/55378002333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45b7854-35a2-4bfe-8505-9d9b7b3d0e61/binupixadubusisomepufudiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f88315-b910-44bf-a9fa-95267a4b5b86/75239151235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e519167-ccb8-4e34-84ea-f2218035fe20/10326269429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda17a7f-d4a2-44ef-a7cc-05ee2eee86eb/vuzetepidudovefazulogugeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e13c30-3851-495b-aa14-66a431704894/serosoxolijova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf12123-9fd1-452a-8889-3705e84f6e3f/53264970633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3825/6535/files/venorokuditekos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3117/8659/files/fun_games_unblocked_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2663/5157/files/82080716490.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_off0000aece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECE 5868 bytes
SHA-256: d90bcfda6a1e9dbc1251f060f8c09c3fcf4637d04bdcb3c3d443ea428fa3de67
font_01_sfnt_off0000c2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B7 16040 bytes
SHA-256: dff123c563dda1fb5148f560ab0f95d4b00ecaad87c72332553f0e42d0cfe33a

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