Malicious PDF — malware analysis report

Static analysis result for SHA-256 884d51ccf17de066…

MALICIOUS

PDF

45.9 KB Created: 2020-09-02 13:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3600b53bea6f63cc4525afc2ae9bd66d SHA-1: 3d758e08665f15aac27fa640fb3a23206b32df64 SHA-256: 884d51ccf17de066c406f853429910eefa934b39945c874af9c1530424cec6e4
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.me/wix?keyword=icarus+verilog+manual 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/79cb75_1be9eefcd2eb449fb108f77d83d4c715.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e4a001_312ad1be708d4a4ea138bfe5bad6dfca.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_86b8e7b476734cdd85e02ed1c7314eeb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c1c462_ffd8534fb99246aa8be4c1f508a79209.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_ed4c20ac26ab43e2b305166b466f6bc4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/834936_7393579daf2b4cc792fb9b3efd65c90f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a83d4616e8a249219a4675ee11e3f3c7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/duzotibafizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7358/4793/files/make_gif_transparent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/kptcl_notification_2020_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9086/8379/files/61002633537.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4d935e_0143da5a6ebb4e23819f7e4fe1469fdb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1a89c8_62bc1404b90e410799df42134cf96840.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d55797_126699fa52d34d8bb5bbe6179f7ad96f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e4f6f0_14a4acd1057c476480f37e44b561c372.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3ab5ed_3bed781156b34e61a8becb1af47081af.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_off00007386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7386 5116 bytes
SHA-256: 94551b0fcb2e2bf9f4625cafa1750951c675e35ffe36cb90e6e9d89ae6078259
font_01_sfnt_off000084e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E3 11268 bytes
SHA-256: 258acf8db6e2b169b8fd6bcf18d63cc2e1e90c9c07ada9de62b1f1b6dbbd9eae

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