Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b98f74c4ec499a6…

MALICIOUS

PDF

53.7 KB Created: 2020-10-19 01:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 269b6691a6f790d5a34564981b90fbf0 SHA-1: 79beed0665c893e0680965f724ead52ab3b58c07 SHA-256: 8b98f74c4ec499a69836633985db02d55f49be63c218bebea5620df11ce8613a
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.cc/123?keyword=%25CE%25B4%25CE%25B7%25CE%25BB%25CF%2589%25CF%2583%25CE%25B7+%25CE%25B42+%25CE%25BA%25CF%2584%25CE%25B7%25CE%25BC%25CE%25B1%25CF%2584%25CE%25BF%25CE%25BB%25CE%25BF%25CE%25B3%25CE%25B9%25CE%25BF+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f89848528497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f86f5feefda2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f878308f226f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f88273dd7716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f8cbacc35e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5f8a5984df28b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5f88de9dd0de5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/712f32b2-c367-4597-9165-fc75cd460d8d/17544722197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9675661-e644-4295-9d2c-8ae0a5ad4ef0/sketching_user_experiences_the_workb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85334700-1031-4aba-a31f-bd6fb88e0194/99459533684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4569e16d-03cc-4518-ab24-d329ab360798/87344172319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab4b52d-cc73-440f-868a-4f9b3343efa4/luzixizevigusalen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/55695421548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9329/8851/files/best_buy_madison_wi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fbbf775-3a44-416d-9e02-54fadd6070b0/46902252485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fec9e43-ec99-460b-93f7-9821c74da278/88482227243.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D5 5284 bytes
SHA-256: b7fcc72ddc2991c2512b9e8df3790a07b37da58887f22db069d39f65772d7a2e
font_01_sfnt_off0000891a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x891A 15508 bytes
SHA-256: 863c847978fad333a9d4ba6814e8e247924ef0d001a2f309b705228f852cb93b
font_02_sfnt_off0000b873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB873 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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