Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f90cce6669963e…

MALICIOUS

PDF

60.1 KB Created: 2020-11-02 17:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3750fb26647e5081fcfa4947d64f84e9 SHA-1: 92102c23ac9a4c79c5624b28c11c663eb3521e52 SHA-256: c8f90cce6669963e4ac11a70746d6cea51a0f7fde47a05985bfee450d72eeb1f
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://ttraff.cc/123?keyword=all+quiet+on+the+western+front+summary In PDF document text
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/7088830.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/6287688.pdfIn PDF document text
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/4101908.pdfIn PDF document text
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/titanovasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f89303994751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f909ae9ed523.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/delelides_dasexurekiwar_jajumab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f8c2b9cba17d.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/4467144.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/paserarowubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1471/7091/files/privacy_guard_pro_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/2250/4864/files/zemusakofagemigonuru.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/santa_biblia_1960.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6657/7062/files/kierkegaard_fear_and_trembling.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7281/8845/files/android_repositories.cfg_could_not_be_loaded.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3C 5196 bytes
SHA-256: 2f2ab886331c4d336abd05d934a71dc2bbf77270d8bf4d342ce02bda6cb3f49c
font_01_sfnt_off0000aece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECE 11664 bytes
SHA-256: 21e042b29e8aefa67ac0cfb9cb82fe28767e1e7e9fab457d2daa9456d1f6c0e0
font_02_sfnt_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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