Malicious PDF — malware analysis report

Static analysis result for SHA-256 351c524fdd3b8491…

MALICIOUS

PDF

48.8 KB Created: 2020-10-30 10:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: c9450e87f8be6a0f9d8965ec25bf9dc2 SHA-1: 1992502b2b7861090f0beb8a0d457f283a312a4b SHA-256: 351c524fdd3b84910f36c90308c7a1a6faedc508e43c187bf7d15db6a77045b0
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://cctraff.ru/aws?keyword=golden+retriever+puppies+virginia+cheap In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f8a5dc4e21e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5f980c781fa2c.pdfIn PDF document text
    • https://dewubolisevibe.weebly.com/uploads/1/3/4/3/134318954/zalewafarute.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005c95.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005c95.bin)
    • http://www.daltonmaag.com/In extracted file (font_03_sfnt_off0000a795.bin)
    • https://uploads.strikinglycdn.com/files/dbfb77e9-ecca-417f-8cc2-334908dc7047/36303032318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e493ddea-240c-4b9c-a5df-7956ab80b820/johnson_seahorse_10_carburetor.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/open_network_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/mumawomijipoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e492af-b9ec-4942-a65a-28ed1a5b2b96/38185001280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5e2d9d-171c-403a-9931-94a2fad694d5/lopaniraruzowapidodowe.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/armature_reaction.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/pdf_converter_to_word_free_download_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff2b802-a1fe-49db-82c6-24a9f538cf0c/bubezamilafuxibuzojom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9840ea-e512-481f-ac2f-a53ee5a39a8e/togavuxomafuxejot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1753652-7632-4378-a4ea-f469861a38d5/xafonej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/407de660-581a-4c39-a6e4-9ac6f9edabab/9889612415.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_00_sfnt_off00005c95.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_02_sfnt_off00009267.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off00009267.bin)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C95 5308 bytes
SHA-256: a967868ba836f64e21667e5aee5917aeadba6223a26e72bc21a29ddf3cb45bd9
font_01_sfnt_off00006e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9F 10624 bytes
SHA-256: 00fa6d534ec5bba534329376167cd0f1cd78b2d841bae657ddc180a094a5b311
font_02_sfnt_off00009267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9267 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off0000a795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA795 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378