Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ead90da737227e1…

MALICIOUS

PDF

43.5 KB Created: 2020-10-01 00:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0d28c63391551de768a6514887aee63d SHA-1: ecaabb9ac1cd6f18128ebf2d684600c3215c89d1 SHA-256: 7ead90da737227e1587a26cf65a7f050d86d799f7cc0abe7a5bb70e2f0f6dba6
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://gettraff.ru/strik?keyword=pdf+to+tiff%2528+ccitt-+g4%2529 In PDF document text
    • http://bofagid.alatheabiblecollege.com/uploads/1/3/2/6/132695388/puwowiwiwugima.pdfIn PDF document text
    • http://files.esteachers.org/uploads/1/3/1/4/131453990/kowanajegaxugetesa.pdfIn PDF document text
    • http://powos.ibewlocal176.org/uploads/1/3/1/0/131070792/bododekabupo.pdfIn PDF document text
    • http://rupupij.hillsidehavenwii.com/uploads/1/3/1/0/131071021/kikivinejemosuzeko.pdfIn PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/95733696824.pdfIn PDF document text
    • https://site-1037202.mozfiles.com/files/1037202/66420670325.pdfIn PDF document text
    • https://site-1037130.mozfiles.com/files/1037130/bevajaripamivemovurafaxu.pdfIn PDF document text
    • https://site-1036730.mozfiles.com/files/1036730/46615338869.pdfIn PDF document text
    • https://site-1039707.mozfiles.com/files/1039707/42037106443.pdfIn PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/95798475687.pdfIn PDF document text
    • https://site-1036917.mozfiles.com/files/1036917/nukulonelalenugiwos.pdfIn PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/68235794563.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/1/0440/2076/0741/files/square_root_of_135.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6790/6975/files/58717737933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6733/8652/files/sapogubezirani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/jokizunajogewixuvel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9676/8673/files/63181004916.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_off00005fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB6 4512 bytes
SHA-256: 0808eb3c7dd06c4089461d6c25ebe01975094b96e0d623267b68233e81a0275c
font_01_sfnt_off00006f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2F 10660 bytes
SHA-256: c7ce413f18f941394a70de1d5288bac22a7eb1d37a888e5bfb854df05b8f95cc
font_02_sfnt_off00009305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9305 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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