Malicious PDF — malware analysis report

Static analysis result for SHA-256 afaced1dfeb66c96…

MALICIOUS

PDF

44.2 KB Created: 2020-08-17 03:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b329b128a3e6a5f0ba5d6359ae4f1fe6 SHA-1: c9c4ddde2fc75b6b9bc1ab5d441eee8c316c20cb SHA-256: afaced1dfeb66c96479b9ba1da082b93b265322c9d0bde3b435b36c56802b355
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.ru/pify?keyword=chrome+devtools+performance+tutorial In PDF document text
    • http://files.speakerthoughts.com/uploads/1/3/1/4/131482975/1c1214b5b.pdfIn PDF document text
    • http://siwewix.sjoachim.org/uploads/1/3/1/8/131860787/6f013556fdedfc.pdfIn PDF document text
    • http://files.theboondocs.org/uploads/1/3/0/7/130776089/suvemavufubelawa.pdfIn PDF document text
    • http://zokema.americanenglishsounds.net/uploads/1/3/0/7/130775085/5674627.pdfIn PDF document text
    • http://files.tncommunitycorrections.org/uploads/1/3/0/9/130969573/kunemixip.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/1/0434/0826/1287/files/fozinasemorutowuluk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/treatment_of_pulmonary_hypertension.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0865/4492/files/fidajuvebujuzor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/kibenawe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/vagipukomiwubekasosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/palipepovetovoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/ginobajosalajukuzum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/17176141981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/raxaworevesezi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8260/2914/files/ielts_vocabulary_for_writing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2367/0176/files/5073759173.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/niwateni.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_off00006661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6661 5360 bytes
SHA-256: 0c4f55ed8bb320c6ef5184a227649b6984141900c6cd28c42bedf37bae879963
font_01_sfnt_off00007883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7883 13792 bytes
SHA-256: 2a1f5e68d5e64550216b1a6ae05c40429bda994530ba638ee09ef8f1c53c1336

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