Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d400e0447b2c3b…

MALICIOUS

PDF

50.4 KB Created: 2020-08-22 05:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a667f908fefe1f45bd1ca0662fdcf68a SHA-1: 2bff4bd28282eb5191c14c305b0373fb2dc9cdaf SHA-256: e5d400e0447b2c3bbe1e5177cc20be4d913a9d69bbe5e48d67025b8be368342d
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.ru/pify?keyword=arabic+language+tutorial+pdf+file In PDF document text
    • http://suwowubud.gretapope.com/uploads/1/3/0/8/130814297/3811452.pdfIn PDF document text
    • http://files.debaerelab.com/uploads/1/3/0/7/130739704/desabotuj.pdfIn PDF document text
    • http://files.ayerpublicaccess.org/uploads/1/3/1/0/131069869/2872705.pdfIn PDF document text
    • http://bagera.algodonesdentistry.com/uploads/1/3/1/0/131070036/b33d6a1e.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/1/0436/8482/3205/files/51474972938.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/5330/1150/files/mujuboruzulaliwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6394/8950/files/60477704288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9770/2046/files/hearthstone_boomsday_guide_lethal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5741/3270/files/certificado_digital_serasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3966/0951/files/ronepajofofikubasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8841/8718/files/rewrite_the_stars_piano_sheet_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sozolomunegodufedawugiwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/72065134665.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/4391/7719/files/yorkville_school_district_report_card.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000942e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x942E 22984 bytes
SHA-256: 5b93a92774b9ab26eefc8b3d2b1b68e7e6f5cb485abfe7055edc5e965046304f
font_00_sfnt_off00005e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9D 5272 bytes
SHA-256: 24b90d515c4cdcad8c48ce8a39be3f675f7691a9eee4d7bdf056ffe7f40c66b1
font_01_sfnt_off0000708c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x708C 10348 bytes
SHA-256: 8899c474b6176714115e6a28d79e6ebf49926d2adecf66095d92124ece1c6f6a

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