Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b90a47614c3005f…

MALICIOUS

PDF

45.7 KB Created: 2020-08-19 21:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a76ec07b72a949c1e38f6b302b68e50d SHA-1: 30ef31b758e247ecb34d5ecc77a448116dd144b7 SHA-256: 7b90a47614c3005f06965ada193a6d52a99ba58814d8cf3cdad9fab989c0d28d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's part of a link farm designed to distribute malicious content. The presence of a 'download button' lure further supports a malicious intent to trick users into clicking through to potentially harmful sites.

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.
  • 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=first+page+of+report+writing
    • http://files.marnacurrie.com/uploads/1/3/0/8/130814611/312e132f.pdf
    • http://tezesafig.coachshi.com/uploads/1/3/1/4/131438641/fetoxomis_zanetijewakimig_vowumofovujavip.pdf
    • http://files.carossell.com/uploads/1/3/1/4/131454986/848ad808c0ff1e.pdf
    • http://minosig.modestmayboutique.com/uploads/1/3/1/4/131406082/matebo_bokevexixip_gatefazujudurel_malegawij.pdf
    • http://files.thehouseofsufyan.com/uploads/1/3/1/4/131407802/6aec00ca67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/54059132912.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9576/files/beauty_and_the_beast_script_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6408/2073/files/chrome_for_64_bit_os.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45251784546.pdf
    • https://cdn.shopify.com/s/files/1/0436/8846/0441/files/kujod.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/udemy_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/timilutumitaluk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.pdf
    • https://cdn.shopify.com/s/files/1/0428/3177/3852/files/cds_ota_syllabus_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0387/0375/files/audit_report_icai.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076a6.bin
b1abca05a6e6b41e2e78ccb3bbfb597d2cf54372e11a08538e6f6796725ad557		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A6 5084 bytes
font_01_sfnt_off00008819.bin
e10d2c3ee5014a56e8ddd34399e78e03c63a39ddc5361ed4949db25df3774f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8819 10028 bytes

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