Malicious PDF — malware analysis report

Static analysis result for SHA-256 8881cf26a0fe1fc7…

MALICIOUS

PDF

37.6 KB Created: 2020-10-08 13:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: dc45fd4f38651312a9e660069250c7a5 SHA-1: d8c3aa4c1d9a27724579eddcd5fd4ca2cc6ebcac SHA-256: 8881cf26a0fe1fc7c257ecb68261ce4f02250e26dffc2c3bf489fe0a995392d4
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=4liker+apk+latest In PDF document text
    • http://foxiti.pleasantviewfiredepartment.com/uploads/1/3/1/4/131406970/lotugatovinatuj.pdfIn PDF document text
    • https://site-1037885.mozfiles.com/files/1037885/japelepesibirinaxezaza.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/ranewowukelefinebixi.pdfIn PDF document text
    • https://site-1036753.mozfiles.com/files/1036753/sabejisisegosufuluz.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/1/0432/3832/6432/files/wobepefebepozog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5267/6773/files/kurio_phone_amazon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0567/4133/files/56808490629.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4330/9726/files/spotify_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/9686/7487/files/temple_baptist_church_hattiesburg_ms_staff.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_off00005802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5802 4872 bytes
SHA-256: ac45a3fafb406122501d680089452d90f431ecf4b5fb6c61c1bf94e195af357f
font_01_sfnt_off0000689f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x689F 9840 bytes
SHA-256: 211769bfc0ab298cc67b45509b6dc19e1f119a15d9cdd9de61ec823c2b54521d

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