Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc31833e69abe22e…

MALICIOUS

PDF

46.5 KB Created: 2020-10-01 02:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 931998d63896eab195ba9389eb01e93b SHA-1: 2e6e880a498e7d7f0229f6580b44b068c9fdf7bf SHA-256: cc31833e69abe22e83d1ea21a6326858354822e9938ee7590691a51f37ba5937
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=hiperaldosteronismo+primario+y+secundario+pdf In PDF document text
    • http://netuduno.shearfinessehairacademy.com/uploads/1/3/0/7/130739624/rawufepevorofepok.pdfIn PDF document text
    • http://pebule.championcleaning.net/uploads/1/3/1/3/131382134/8272b4cb409.pdfIn PDF document text
    • https://site-1039874.mozfiles.com/files/1039874/73915039465.pdfIn PDF document text
    • https://site-1036729.mozfiles.com/files/1036729/dotefixuvivukivapem.pdfIn PDF document text
    • https://site-1037869.mozfiles.com/files/1037869/dejiz.pdfIn PDF document text
    • https://site-1037869.mozfiles.com/files/1037869/41995906839.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/1/0433/0687/7080/files/48465164240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xakikalimakimoxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9107/3947/files/81494170710.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0159/6069/files/bahubali_2_hindi_watch_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/contracting_disease_from_dried_blood.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/how_to_add_modifiers_tinkers_construct.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/raxiwubavowexalufuxowe.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_off0000748d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x748D 5364 bytes
SHA-256: 7d876c5a7d5132fcb19b3304f2c9458d1370f80d083495be725a143c3098bb30
font_01_sfnt_off000086bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86BD 11196 bytes
SHA-256: 8ade1205b8e79eea9b5a7e627ca1cd6f6c1f9d62bdd54b38d0395ee2d8b32512