Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f4398210bf8ba2…

MALICIOUS

PDF

48.2 KB Created: 2020-10-15 16:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: a231d19de6b57e928b36c83593207919 SHA-1: 2d9c33dd7c1d29dc337fd73d4847f4dc219e96ba SHA-256: 42f4398210bf8ba2e2978ea9d51c495202bb782528ce6b17d584249123917e95
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/7125457.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.cc/pify?keyword=complete+university+guide+business+studies In PDF document text
    • https://site-1040282.mozfiles.com/files/1040282/80526072513.pdfIn PDF document text
    • https://site-1037203.mozfiles.com/files/1037203/14806894834.pdfIn PDF document text
    • https://site-1041169.mozfiles.com/files/1041169/damovaxamanibat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f871d9b846e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f87ece00f3ed.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/7125457.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bagatazojiz_sidatasofugugor_sofaxazute_gureluf.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7775416.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/78dfee83-5dc3-4403-8d95-3bf395b6719b/lofezebemizugazubijegeriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6a3a8b-104d-4f11-bcf9-36f76d68a33c/51702214962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2096dc8f-a9ca-4f66-b5d5-307683084b75/jakumogejepaxukewutib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4736b7b0-5a00-43d7-b8fe-cf21bfc04e41/62479195204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d87485-47e0-495b-a0fd-36d06fd9bc31/42038039373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca11b54-426f-4bf3-ad9e-418811dfb731/86033641594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acdb530-c85e-4c1d-abcc-b2821ac10573/46388102481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525ccbbf-019c-493d-aef9-dada8c4142e7/pikepese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8852/2650/files/87432605949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2036/9576/files/23224273901.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_off00007d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D57 5276 bytes
SHA-256: fe5b05c155343153454b6d2a21325d6222dd1280c4ad5d682117a7814769a92b
font_01_sfnt_off00008f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F35 10520 bytes
SHA-256: 8b7b65cec47cd0ef74049a385468901e84e3b80e13b0a341e0d20b3c89f966d5

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