Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bda9af9b99cca6…

MALICIOUS

PDF

67.5 KB Created: 2020-10-10 06:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4d797cb830d44b61c1782993f2609f9f SHA-1: 6c4000be310345f18e343380ed5a2755a05c432d SHA-256: 55bda9af9b99cca621d4aaf03ba4889badaf304a69b4e6c7ce86a428ed909a07
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/strik?keyword=ghost+in+the+shell+stand+alone+complex+-+solid+state+society+%25282006%2529 In PDF document text
    • http://files.immigrationattorneyforsanfrancisco.com/uploads/1/3/0/8/130873759/zosobowozasosodebizi.pdfIn PDF document text
    • http://goxere.gambiarising.org/uploads/1/3/2/7/132710589/2840289.pdfIn PDF document text
    • http://files.tarawattdesign.com/uploads/1/3/0/9/130969377/b64bcaf9f.pdfIn PDF document text
    • http://files.artbeatarttherapystudio.com/uploads/1/3/1/3/131398095/95d90.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/1/0428/7732/1379/files/rogeguwepimokakaroxeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2717/0981/files/xexutitenipoponulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2802/0373/files/luxugetub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7224/4900/files/crayola_marker_maker_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894dc29f-87fa-42f1-896a-6b8e1bcd0e8f/4825964389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b26c4ee-bc77-43bb-b8da-c736b0e4ee0e/deditewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2eb9afe-9d53-489a-a3c9-8cdfb44fc3af/tejokumuvedasurugutigitom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/420ef515-f1d3-429f-b715-0f7d85023c6f/76571417556.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9044/8035/files/primal_savagery_5e_dndbeyond.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/tia_and_tamera_parents_on_the_show.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9670/5697/files/kavukaratidetugigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0098/9349/files/holy_spirit_living_breath_of_god.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/80486671562.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_off0000981c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x981C 13680 bytes
SHA-256: 72ff81670d85766296d956c8b698f53b5da5799bfc18b0b8ab23a59f03b9aea9
font_01_sfnt_off0000c46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46E 6032 bytes
SHA-256: 717274ddaf8c40fd9861632c19fbae7eae224fd05df4177ec4387d8ed3bdcc3c
font_02_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 11276 bytes
SHA-256: 6b743309670050d5d1ec24e4dae4469bd523ff84bea161a530b0063c2e188acf

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