Malicious PDF — malware analysis report

Static analysis result for SHA-256 df58fe23f7320355…

MALICIOUS

PDF

52.1 KB Created: 2020-10-06 13:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ebb92120138bbdc99880999672d610c0 SHA-1: bed8ca870373ac00145791b8ca4ef9f4c6889da4 SHA-256: df58fe23f73203554f701ca51710a86fcf06850b5d4e5ecf2ad125f4dab78f2a
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/pify?keyword=modded+apk+sites In PDF document text
    • https://site-1042892.mozfiles.com/files/1042892/dizaxanidufizedilefezefu.pdfIn PDF document text
    • https://site-1043489.mozfiles.com/files/1043489/ponegowipurigoxuraribi.pdfIn PDF document text
    • https://site-1036880.mozfiles.com/files/1036880/nabuvukegotovuwuzojodopod.pdfIn PDF document text
    • http://files.streetcorephotography.com/uploads/1/3/1/4/131406222/3065578.pdfIn PDF document text
    • http://files.nakskovroklub.dk/uploads/1/3/0/8/130814172/5921362.pdfIn PDF document text
    • http://senad.emeraldtreeexperts.net/uploads/1/3/1/1/131164250/6368024.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/1/0436/8505/2566/files/53467226492.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/essential_elements_of_a_valid_contract.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0743/5167/files/2016_kawasaki_mule_610_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5714/7815/files/capital_appropriation_request_process.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/puzusixuluvowor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94d8732d-912a-410a-a8af-3184a8dd5c2e/32206452896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ede2d82-6488-4228-b46b-532ff9ef5140/rimiboxubedavetasawuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21dd1caf-f6f9-405d-9b8e-2a6bcb11df07/xebigel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ae24d5-f77e-4e23-874c-82e8583611e5/40807417326.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3A 4892 bytes
SHA-256: 1dbb3115bd807058b90c69f49aa0e4510eb547f4c64b4cc5e1c8dda349df6f7f
font_01_sfnt_off00007e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E02 14852 bytes
SHA-256: e6c6cea95b65d9918743a5984ebcb765b92be3f3f7beede4a5d34435d5441fd6
font_02_sfnt_off0000ad07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD07 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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