Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d06ba52daa9597…

MALICIOUS

PDF

43.3 KB Created: 2020-10-10 14:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3fd78b5faba47726c7c4a4073a244fa3 SHA-1: a72ccc05d9ca013db26342878dd40a7e2acce2a4 SHA-256: b4d06ba52daa95974963aff4e8544de665b0a5aa5f1f0200b1d679f15979d3e7
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/pify?keyword=letter+of+protest+example In PDF document text
    • https://site-1043690.mozfiles.com/files/1043690/29013653721.pdfIn PDF document text
    • https://site-1040360.mozfiles.com/files/1040360/48554817255.pdfIn PDF document text
    • https://site-1036754.mozfiles.com/files/1036754/57024659978.pdfIn PDF document text
    • http://files.colleenshaunawaters.com/uploads/1/3/2/8/132814136/neluwisezogopesef.pdfIn PDF document text
    • http://povipud.andfairphotography.com/uploads/1/3/1/4/131406381/9685384.pdfIn PDF document text
    • http://jevuj.papajeffstiedyes.com/uploads/1/3/2/8/132814476/3c60db64c8de6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27c42bf-6d85-4696-80d8-8e43ea7108db/boremenimosujuxezosori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b4e4f5-b031-400e-9794-44e5a39a5327/filidej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d456dc7f-d2d9-4b9c-8b91-419c0c2f78d9/kugedala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4397d80-ac61-4e35-a5f4-bab392fb2ac2/6775229684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2f0e7b-5513-4976-a458-74f5d7fc1e42/tubapizivovitimobezus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64bcf83f-a4d0-4dec-a043-10320578899c/juxuzewizamipudulitagabi.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_off00006db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB2 5056 bytes
SHA-256: 8f181a1aa43af88499b998a51fb44b54195550fc5a8520ef9e35d84763398500
font_01_sfnt_off00007ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED4 10028 bytes
SHA-256: 1fc8083d1a88191308261187015413b0b2ef0fc96aafc71fcc2aea00fd57585e

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