Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cb8fc5ac91dea4…

MALICIOUS

PDF

49.1 KB Created: 2020-10-28 07:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: f649edbe3b1fcbfb31fdbdb0aa053a04 SHA-1: 42302ee6b8b58a919c487dcd179bde09671fdc08 SHA-256: c8cb8fc5ac91dea4ee8f6016a3d7c595f9e245cbfe5216022a8fe143ddc23413
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.link/123?keyword=choque+de+cultura+renan In PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/54c86654.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/waxegof_vipowe_javidosekepod.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/gudadege.pdfIn PDF document text
    • https://wilunozuwi.weebly.com/uploads/1/3/4/4/134432110/sekexikelosonol_ziwawivaj_xuwotitoxinoju.pdfIn PDF document text
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/dubepeloguwobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f93008371395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_5f8f2f52933e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5f8f73c1539c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5f904b862a49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f86f8954236e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f870be52d658.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_01_sfnt_off00007dc9.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_01_sfnt_off00007dc9.bin)
    • https://uploads.strikinglycdn.com/files/39eb6282-a642-4270-a3f8-7b9401b36ef1/a_silent_voice_english_dub_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/809b3907-f1bf-4896-9cd6-552c9c71a27b/westby_high_school_supply_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3851bbcc-50bd-44b3-b408-786a8fab4d3b/45236205072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ac93a9-4ed6-4184-81d1-031e1cd48f77/jelap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b7f02d-a766-4776-9ed5-27fed37ccb0d/89425113686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959c8243-6485-4eb6-9409-fd6e4e5651cd/54712747982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8e6264-4844-40a7-8a37-a28673bbfe33/vojojipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4970a7f-525e-46bd-b6c3-428af8ed1926/guwegejukodaburuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1f4ca3-263a-430a-99aa-2c3855e374ec/tefamesoliludelinizubufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9c83e5-5f30-468d-bd3d-faaa86a3d63e/53546200352.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 extracted file (font_01_sfnt_off00007dc9.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2D 4680 bytes
SHA-256: 607bc8dc6ff950b8c18ced1efc2339e621750ed2d1fcb69e182d6afbb29df576
font_01_sfnt_off00007dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC9 4880 bytes
SHA-256: ef93a430a65193b80c699ca1c4e3f7550be0a9bd937beef4bd06839bdbfb9f03
font_02_sfnt_off00008e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4F 11812 bytes
SHA-256: db3f03b16a41e238f4e1600ea8d29def9f5ff3395d27e5ca8c250065f2080429