Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dee4e5bf25a693…

MALICIOUS

PDF

45.0 KB Created: 2020-08-22 13:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 9893d9b0b8cf5445ca32d0b0b278f4d6 SHA-1: be8308095aa5f2c1982ad1d84fa2b8bc82f5e02b SHA-256: 20dee4e5bf25a69340e49951b7d0748cb3c4d043a769a939482c6cc9a969c78b
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.cc/pify?keyword=i2+analyst+notebook+9+user+guide In PDF document text
    • http://files.diopayouth.org/uploads/1/3/1/3/131382092/gakexopewiwivak.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/1/0432/2469/4942/files/87634748792.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0235/6124/files/72488817475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/equilibrium_chemistry_class_11.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/19993686256.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4121/6917/files/87017227244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7242/9980/files/99020576842.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5189/0341/files/49971642078.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5227/6632/files/ccna_notes_with_practical_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4904/9499/files/imperialismo_japones_caracteristicas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/47536755466.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_off00006103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6103 5408 bytes
SHA-256: 9ec7d8a8cf18b312e052bea51412e49d5cfc5bbeff6b4c94fb4c916296c7e2af
font_01_sfnt_off0000736a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x736A 11464 bytes
SHA-256: b25a62c0808fbba932829e0fa54791d14461a255346c5b7948dc93cda3f1b820
font_02_sfnt_off000098e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98E2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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