Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3e984e9fb86660…

MALICIOUS

PDF

54.6 KB Created: 2020-10-03 03:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: cfbcb634048ba2b382545c9b5a53e328 SHA-1: 7bd6110482d7b6b3d22ecd6d54ac939daeb9e10a SHA-256: 4c3e984e9fb86660b909703e79a117161f5f7c7ebba66fd1bfb6e77fac4a557f
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=hk+usp+variant+7+trigger In PDF document text
    • https://site-1036985.mozfiles.com/files/1036985/sutugebiruremimotu.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/84727111719.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/xajowexugavimajovowewe.pdfIn PDF document text
    • https://site-1039632.mozfiles.com/files/1039632/9344063940.pdfIn PDF document text
    • https://site-1043215.mozfiles.com/files/1043215/35220913171.pdfIn PDF document text
    • https://site-1037149.mozfiles.com/files/1037149/45105375549.pdfIn PDF document text
    • http://files.becsandys.com/uploads/1/3/0/7/130740323/9203486.pdfIn PDF document text
    • http://zefup.learn-bhangra.com/uploads/1/3/1/4/131483065/f38114c.pdfIn PDF document text
    • http://files.landofmadmen.com/uploads/1/3/1/3/131397927/nexixofumekata.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/1/0436/9979/8166/files/rock_paper_scissors_game_visual_basic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2960/1175/files/99113374495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/0263/8748/files/science_olympiad_water_quality_rules_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4823/8241/files/37429067114.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_off00008b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B68 5120 bytes
SHA-256: 79734a42c2a09e8720abf0935960655440937c22787335399df7ed671f585811
font_01_sfnt_off00009cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF7 15544 bytes
SHA-256: 0ba50d62cab30eb1b14454a9e73a704b02f9c1f1f8c6c354dc1afefbefa6f1fb