Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c88005a77c9574…

MALICIOUS

PDF

47.8 KB Created: 2020-10-13 00:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: f17f8261428858e273229c831859fcf7 SHA-1: 7b93d46221fd22b60b16f2c87acc5c9dbd9d750a SHA-256: a1c88005a77c95742f015ce7b9054f2ed1641a4054e501d80dc79109ec52e0f4
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/strik?keyword=amazon+product+research+pdf In PDF document text
    • http://pamek.starhouseartandmusiccollege.com/uploads/1/3/0/8/130814017/93df42cb7df7.pdfIn PDF document text
    • http://files.trigonarchitect.com/uploads/1/3/1/4/131453431/9189856.pdfIn PDF document text
    • https://site-1037849.mozfiles.com/files/1037849/risatofiguje.pdfIn PDF document text
    • https://site-1040208.mozfiles.com/files/1040208/78449420583.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/acd14bf2-25bd-461d-a5da-aa18d112df2c/11194351678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0079b08b-0994-4342-a81c-af2e11d3de7d/35730043953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1081f52b-4f14-4b93-932a-491a229d6933/53794664263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790c8edf-489a-474e-8fe3-668490366062/gagetowaxixeridopaxurape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6925/0983/files/mukudogomepanufeje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9017/4886/files/citra_mii_maker_not_working.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/ultima_water_system_model_vii_replacement_filters.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/8320/9373/files/gegupedugezagubizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0380/5600/files/closer_survival_guide.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_off00007cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD5 5404 bytes
SHA-256: 90625fea8a84e64a8f950e71b36c86055d83aa1731e6992fb504fb6bbab0ef1b
font_01_sfnt_off00008f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F06 10256 bytes
SHA-256: 8223e4c034e3038155429676e3f398305d3d65043bc226f6e251f35a1e1e627c

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