Malicious PDF — malware analysis report

Static analysis result for SHA-256 24aa670a4cb8b00c…

MALICIOUS

PDF

53.1 KB Created: 2020-10-04 13:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5bf7d3ceee1105be90dac56d88019c20 SHA-1: ee3995e1838ea00a3d2c9f8e2d21f8b3e9201930 SHA-256: 24aa670a4cb8b00c6a7783212973e92bab073722ed71ac4ddd889a47d2f65a3e
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://gettraff.ru/strik?keyword=con+%25E1%25BB%2585nh+%25C6%25B0%25C6%25A1ng+v%25C3%25A0o+nh%25C3%25A0+l%25C3%25A0+%25C4%2591i%25E1%25BB%2581m+g%25C3%25AC In PDF document text
    • http://files.carlisleconcernedcitizens.org/uploads/1/3/0/9/130969356/1edd8.pdfIn PDF document text
    • http://soruruzuj.bbl-clt.org/uploads/1/3/2/7/132740281/rolitavitadetoko.pdfIn PDF document text
    • http://files.ladamedustlaurent.com/uploads/1/3/1/4/131453522/lifuli.pdfIn PDF document text
    • http://files.gogotrain.eu/uploads/1/3/0/7/130740213/7043370.pdfIn PDF document text
    • http://diweto.tpstraining.com.au/uploads/1/3/1/4/131411341/5a970968a4147.pdfIn PDF document text
    • https://site-1038508.mozfiles.com/files/1038508/natipef.pdfIn PDF document text
    • https://site-1039621.mozfiles.com/files/1039621/givumun.pdfIn PDF document text
    • https://site-1039848.mozfiles.com/files/1039848/9418217812.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/1/0435/3127/2351/files/23684442958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8215/4135/files/doxycycline_dosage_for_dogs_with_ehrlichia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5992/7448/files/hopkins_preschool_aberdeen_wa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1365/4696/files/virginia_drivers_manual_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1046/9283/files/13036604222.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3827/3447/files/96990259797.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2825/0276/files/puzusavizuzidozijironapit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5116/8156/files/74570983915.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_off0000742c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 5440 bytes
SHA-256: 8de8e995be5331bbfee48bae60664fc7fbe010c00d1dc1a4628a41fc9645eb7c
font_01_sfnt_off00008622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8622 23136 bytes
SHA-256: e0cd891e69ad9ded3715883c19bb6393ce4bcc332e3f07a10a96e82d5356ffea
font_02_sfnt_off0000b74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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