Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dd9661bdd099e8…

MALICIOUS

PDF

44.0 KB Created: 2020-10-02 18:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: fec9632a382b48e391f2f1f99639bb9c SHA-1: 120d40ba4639432ccb77398b755817acd4deb46f SHA-256: c8dd9661bdd099e8cd73ec6f183f00b0c3b9a1e37e9393043c86272551be9b3c
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/pify?keyword=tru+triple+slow+cooker+recipes In PDF document text
    • http://kolovejad.theoverflowing.com/uploads/1/3/1/4/131438003/tipukewaw.pdfIn PDF document text
    • http://files.solomonracquetandsports.com/uploads/1/3/0/7/130775304/539980.pdfIn PDF document text
    • http://soxevo.myrnapearman.com/uploads/1/3/0/7/130739098/9b522d620843.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/1/0483/0189/9938/files/vilizavupilibinurimevu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/55130659988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2622/9666/files/exponential_decay_worksheet_kuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5030/9531/files/spectrum_tv_guide_del_rio_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73a0e86-e34f-4eee-8078-cabf4198b529/404928649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4454c4bf-98c6-43d5-aa0d-b89839c17552/34736166139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b15a0a3-30d9-4463-8851-4ae6b5649d15/9322332798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35949365-b36e-436d-a9fb-5b4e0b45b64a/70112202036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f11bb984-a569-473f-8b28-81081673219f/83983923890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bccda1b3-eef1-4c5f-bed8-2b318916688d/sifawe.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_off00006f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1B 4820 bytes
SHA-256: b4f787c26f50f9b22e391ed50cefdb76d9f58a210da9b819fafc2b43de57beb0
font_01_sfnt_off00007fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA7 10524 bytes
SHA-256: e25e553b0d416e24a4b70db963275b74fc18fa4bc14cacd4eeed35fea90e5b51

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