Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cad5dcabab2c2f7…

MALICIOUS

PDF

47.3 KB Created: 2020-10-09 13:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 0c886571d988d97992cefb7f525dd951 SHA-1: eac380ae19915f845155e484ac54584196373ffb SHA-256: 4cad5dcabab2c2f77be6e1889eb57967403a270a1fbc015bc0d471f093222d0f
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=google+drive+moana+pdf In PDF document text
    • http://files.russellhillberry.net/uploads/1/3/1/3/131398322/xuvopekeriwizir.pdfIn PDF document text
    • http://xugoviv.kwtintl.com/uploads/1/3/1/4/131406449/topanadazanuboja.pdfIn PDF document text
    • http://files.43squadronassociation.com/uploads/1/3/2/7/132740413/kesaxavoxibaxosuzabe.pdfIn PDF document text
    • http://larewanes.morganmrich.com/uploads/1/3/0/8/130874179/7848857.pdfIn PDF document text
    • https://site-1042879.mozfiles.com/files/1042879/79597718629.pdfIn PDF document text
    • https://site-1039398.mozfiles.com/files/1039398/loroje.pdfIn PDF document text
    • https://site-1038519.mozfiles.com/files/1038519/15519740759.pdfIn PDF document text
    • https://site-1038586.mozfiles.com/files/1038586/wudodopi.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/1/0497/4664/1060/files/cytochrome_c_comparison_lab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1548/7135/files/phd2_manual_dither.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0081/9622/files/51688422113.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2417/7560/files/antigone_act_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9597/6856/files/alexa_manual_free_download.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_off00006c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C84 5272 bytes
SHA-256: 160646dcdec5a070c97083152d92ed781e9ad7e37112c7d3c29960ec82c33df3
font_01_sfnt_off00007e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E62 2492 bytes
SHA-256: 594a5d8d9e2d92a7cba8d9a232a29bbfaa2cdc63194a46d46e7386393a9b3a75
font_02_sfnt_off00008927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8927 11968 bytes
SHA-256: eaa9dbf7a66fc9fb8846ae93c880e0b17a59e02cafa37f930b93265cc6863158