Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3e69f1e043be26…

MALICIOUS

PDF

43.2 KB Created: 2020-10-03 14:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 2dc070f7279a0b10972f09889d506285 SHA-1: 1880e085ca55f8d7b7cd090ced53b29c6efbd177 SHA-256: 3f3e69f1e043be2624250076013e0a579de5dc17f3bdc960689a4f74ef2adcd3
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/strik?keyword=challenger+crew+autopsy+reports In PDF document text
    • https://site-1037233.mozfiles.com/files/1037233/sepajubew.pdfIn PDF document text
    • https://site-1038967.mozfiles.com/files/1038967/xegaxupal.pdfIn PDF document text
    • https://site-1040600.mozfiles.com/files/1040600/15261609801.pdfIn PDF document text
    • https://site-1036798.mozfiles.com/files/1036798/34809549043.pdfIn PDF document text
    • https://site-1038309.mozfiles.com/files/1038309/94456705434.pdfIn PDF document text
    • https://site-1038728.mozfiles.com/files/1038728/sipobipudupazigamisojule.pdfIn PDF document text
    • http://files.wadslaw.com/uploads/1/3/1/3/131383514/6a146f0.pdfIn PDF document text
    • http://daduvopig.thebestclass.org/uploads/1/3/1/4/131482833/nigigekogiw.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/1/0481/8442/6645/files/xibitize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/gizof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2931/7797/files/norfolk_registry_of_deeds_land_court.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0923/1006/files/alberta_infant_motor_scale_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/ace_endico_danbury_ct.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_off00006b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B41 5292 bytes
SHA-256: 5e34e88bc1ab83f38a82897df52463290b61c04c99421fec461693ce2d19cee3
font_01_sfnt_off00007d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D52 10088 bytes
SHA-256: ba5e3445d628f2995066a32d06c23ec998e158b2d95f5bde2a131cc1cd0eb47f