Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7e1f64ada5dba3…

MALICIOUS

PDF

41.4 KB Created: 2020-08-16 13:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4548c52b25dd63acadb82e438b8b6ca8 SHA-1: 9d608669afeda693a26e04d368f9e3a57a57b006 SHA-256: df7e1f64ada5dba315c5936da3dd50221275611584bfc32b7d532d60aabb2ea0
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=free+printable+worksheets+for+kindergarten+alphabet In PDF document text
    • http://kizex.surbiton-tolworthhealthcommunity.com/uploads/1/3/0/7/130775897/abcf78412c77504.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/1/0427/8855/2870/files/difference_between_2nf_and_3nf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8922/2045/files/34028754200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70913092576.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3513/1036/files/database_administrator_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9900/5863/files/gst_books_for_ca_final.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/legopagora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/faxusumowavunisipor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/30170712408.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9662/7616/files/california_dreaming_menu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/32999326066.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_off00006325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6325 5556 bytes
SHA-256: e49f63567c2a197a42dd87646a373e7ef6ca0daab246d156b1741e8e4eb10495
font_01_sfnt_off00007609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7609 10144 bytes
SHA-256: c7a5f4e651e5b9ec9c9ed0b3a78a093305ecf9e8efdc56176f8d33eb90e19f88

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