Malicious PDF — malware analysis report

Static analysis result for SHA-256 687ccf77b9f052bf…

MALICIOUS

PDF

35.0 KB Created: 2020-10-04 17:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a42acb5b9b796306569cc4cac3be22c0 SHA-1: fd7691cbe319e967de03a7f27a1444c395b60609 SHA-256: 687ccf77b9f052bf0f4511ef2092cbbc3a5eeadf5db484355d991954cc0a87bb
204 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/strik?keyword=paradise+coldplay+piano+sheet+music In PDF document text
    • http://wemanobew.upstagenydanceacademy.com/uploads/1/3/0/9/130969525/lapubodujexu-pejitug-vanutizoju.pdfIn PDF document text
    • http://xeduxi.onstedkiwanis.org/uploads/1/3/1/3/131380594/gozepomerizi.pdfIn PDF document text
    • http://kifali.latelierpatisserie.com/uploads/1/3/0/8/130874380/978217.pdfIn PDF document text
    • https://site-1038707.mozfiles.com/files/1038707/josikosarefojaj.pdfIn PDF document text
    • https://site-1036848.mozfiles.com/files/1036848/39502526410.pdfIn PDF document text
    • https://site-1039431.mozfiles.com/files/1039431/zosinalugofutowafukotino.pdfIn PDF document text
    • https://site-1037122.mozfiles.com/files/1037122/lavinazamenedanel.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/1/0483/0973/1483/files/crabapple_cove_maine_population.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/paragraph_practice_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/jaxazeri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f506dc-fca0-4918-9d38-dfe06a6c9d49/72163995753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3499950b-2040-444e-bfc1-aa6338e88193/32680538117.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_off00004c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C52 5416 bytes
SHA-256: d281e44e1197db05bbe571f61216bbd6000b048dc08b19deb787f160fa7ab28a
font_01_sfnt_off00005e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9D 9636 bytes
SHA-256: 46afb70345ee03f5bf171e557107668960e4692126cb15ce65a44818ccd7d22d

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