Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7421ed3b32b622…

MALICIOUS

PDF

43.1 KB Created: 2020-10-01 01:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: bc68b647378f60d3b9ca373eb3cbdcd9 SHA-1: 814c9c9c6febbfacbf14d514af4efd61fb576038 SHA-256: 8c7421ed3b32b622612756cce15fbf48860c9923f6e9f143da792e5ce2e3e094
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://ggtraff.ru/strik?keyword=graphing+quadratic+functions+worksheet+algebra+2+pdf In PDF document text
    • http://files.nortsstories.com/uploads/1/3/1/4/131408172/gakew.pdfIn PDF document text
    • http://files.delloewenthalphotography.com/uploads/1/3/1/4/131437806/6574307.pdfIn PDF document text
    • http://files.jkdesigncompany.com/uploads/1/3/0/7/130775818/7e2af.pdfIn PDF document text
    • http://ridojoxi.southernwineroads.com/uploads/1/3/2/6/132695424/fujokelak_rixuwolan_bigizilita.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/1/0432/6676/9058/files/19472787971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4504/3880/files/exercises_verb_to_be_simple_past.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8335/6565/files/hp_flex_10_default_password.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0681/1550/files/67354809242.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5438/3782/files/windows_performance_benchmark_software.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9449/9743/files/vetukofenorisegalupilamar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9960/1558/files/91604907515.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/79963167184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6a8933-6732-4a89-91e7-5bcd5aa1f23f/65997655545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51cdf03-8ee2-4a50-b6b3-aeb77d095cd0/pakusukataxadetuniwarafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aab037e-7b70-45c5-96fb-4d20f28a43ce/62208355888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5d879f-a684-4d1c-aa3b-de55b3f67bcd/15702195836.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_off0000688f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x688F 6000 bytes
SHA-256: 2896d7cc850de7af95571fcd041dcac42117bb2a36dfa7573ef8e655e587b485
font_01_sfnt_off00007d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D03 9964 bytes
SHA-256: be1e2f2f56418d5b6e91d975a30901ff9ccdfc0abb595c3e9efb435a4cbcd795

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