Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fd54cd20c20849…

MALICIOUS

PDF

41.0 KB Created: 2020-09-02 11:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d8b924d85f8546be278d225d90061633 SHA-1: 5e8321574d616759c4d6e05a18d7c9f1fcaf58e5 SHA-256: 88fd54cd20c2084937de4e47b4679322c72ce654d6e813f58ed777c868efa7cd
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://ttraff.club/pify?keyword=vimage+cinemagraph+pro+apk In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_00d660db7dc74301b8966681077a6c88.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4117a9_cb7330f131c84e4882d89ed8b20b201c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_591654e411f94a9eab90d94087a75b17.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/80c1db_f48d2ee7e2974ce8a5be767fdfb0100d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d480769a35384017974c1bb12043c8d9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cec570_2cc12c971cf54b77b315daa4079c48ce.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c6a84db1d3c84a13923782fe608b4d7d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5926b4_4a303434da804feda2dbc3de6a652b50.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/android_messages_not_sending_attachments.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/7878/2869/files/migixaxezepixe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0722/9597/files/safari_magazine_file.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_5eacee2a93254c0b9deddc85a31da4c3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_0c019b9e74c742288d9546c192187095.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7041e4_768085a608d446d18b17acd96d7aa85b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/902d29_4fec2af5870247c797be2f6e08e44b57.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ae15ca_e07a88e9fc30415fa286f5f220914790.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_off000063e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E2 5168 bytes
SHA-256: 77d8dbdc0309d974a0405666fffd40dd01dea42e8cf1febb241267d2967cb71a
font_01_sfnt_off00007551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7551 9968 bytes
SHA-256: 9e3cb75188b5410b30290c2df75db1892c21364fd1ed07c9de97cae74e4cb9cd

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