Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99dd09b23fc12da…

MALICIOUS

PDF

47.8 KB Created: 2020-10-02 11:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ca271772d55939f2e3cd75de71482f88 SHA-1: bdd886c8d16d70281bac4dc1121318a4bf0a0d8d SHA-256: e99dd09b23fc12da499c6493f1be62f78c83980915c3d3153f4f2ae015f94878
214 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.
  • 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.
  • 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=estilos+de+aprendizaje+modelo+vak In PDF document text
    • http://lenari.sackindnesscampaign.org/uploads/1/3/1/3/131398101/8a16fee4fba.pdfIn PDF document text
    • http://files.blaqsharkskate.com/uploads/1/3/2/7/132740730/f38d287.pdfIn PDF document text
    • http://files.bonziblend.com/uploads/1/3/2/8/132816066/fajowinogov.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/1/0481/7050/0263/files/gujijujazedoregolowewu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/6140/1768/files/54581795674.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9932/7138/files/30579265283.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8722/3198/files/government_code_6254.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8313/1805/files/tonojosuseponelonowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0457/5387/files/69525422899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9258d955-88be-468c-b6f6-f2a7c3ba2c99/duvufowovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d05e29e-84a7-4962-b0e9-7a30bd73ff25/31973590705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975a6989-3fe8-4c7f-8880-72e02c499cc3/49017692466.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_off00007a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7A 5312 bytes
SHA-256: ecb05702722c9e9228fbc70b824cf33abf2532df68382ed2bde8bdae5587ded1
font_01_sfnt_off00008c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8D 11620 bytes
SHA-256: 06a432987447e0130d9a4d8ccce7308529d2bcc0f24f00cfb5ad26770aa8275e

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