Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb2cd983457b56a…

MALICIOUS

PDF

52.2 KB Created: 2020-10-03 02:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e692bc76bc0576be5d0fa82baac05342 SHA-1: bc90a4c0ff13a66a96eccda2704ee85a44897919 SHA-256: 9cb2cd983457b56ae0148c18042441b18dd4b4df177b320e0c2ddcab519264ad
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=infinite+series+calculator+symbolab In PDF document text
    • https://site-1036820.mozfiles.com/files/1036820/dojotobujulobejevonagefi.pdfIn PDF document text
    • https://site-1038851.mozfiles.com/files/1038851/radomutotex.pdfIn PDF document text
    • https://site-1036694.mozfiles.com/files/1036694/36439345165.pdfIn PDF document text
    • https://site-1039329.mozfiles.com/files/1039329/tosobofibobawomoju.pdfIn PDF document text
    • http://xewatanu.johnwmefford.com/uploads/1/3/2/7/132712615/3d8a30c127a6.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/1/0435/8206/2753/files/rome_and_the_rise_of_christianity_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4451/2154/files/camp_lemonnier_survival_guide_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8730/6658/files/pitujumuludusoza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1518/6843/files/vixetelegiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8643/3435/files/29628654811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491c3cf0-3f5a-49cd-95cf-a326396be3ef/67908421954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94cf5bc1-e278-4c6d-b48c-3cff3f4a7b66/lupixogozugupewuladaminer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85d5206-dd08-444f-9ba0-3b1ee42186b5/36188229436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d973a112-b764-4d23-a763-1da1d125ebb3/39173420510.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CC 5204 bytes
SHA-256: 4c8971ebdd5f457a5ac0a0003247199d81c85a7e63399421c5a942d31788fd47
font_01_sfnt_off00007a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7A 15984 bytes
SHA-256: a88432d26bf2bcdd2ec3d8941969b6c9ab850d0eaf4d697b7786c1f3c0f840f8
font_02_sfnt_off0000ac37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC37 16080 bytes
SHA-256: a534b91c4ec3d8756e3a834051570443c69e75f38d6508a28567570861ffac3d

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