Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4646871ac7a3af…

MALICIOUS

PDF

43.3 KB Created: 2020-08-21 17:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: fe742be48dfb8f46f10ba0eef4ebd788 SHA-1: 2fe35949ff75e5a34185d6c70d0c194dde68e9bb SHA-256: 9c4646871ac7a3af769bbdff60b7cd3806ebf9a6a5cf9102cbaf66ebc2d209c6
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.com/pify?keyword=ap+chemistry+buffers+pogil+answers In PDF document text
    • http://files.bullbearkidsbooks.com/uploads/1/3/2/6/132681404/medewesiposade.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/1/0433/9744/7836/files/attack_on_titan_episode_25_english_dub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/27230627104.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0746/6916/files/nifaxapopa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2634/1278/files/45733351669.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/ti_whatever_you_like._mp3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5398/9534/files/12606104937.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/rowopenowosukudamunilovuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/zukafisasulimonuxoku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/10295376018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1271/6701/files/23672554892.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_off00006113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6113 5752 bytes
SHA-256: 89c29054dcbb4ba3c9189ef7c24f7f53d68e920b51e5088b5fd40f5f15e80cb1
font_01_sfnt_off0000748d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x748D 14288 bytes
SHA-256: 1868e98fe58952f247b60d93628e7c0914985ec5c906ac95a1c7f2cc92698009