Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1f0bf8a713dd26…

MALICIOUS

PDF

48.6 KB Created: 2020-09-17 03:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 69f037a47c4ad9f8c8e26aeee1f8de87 SHA-1: 944df3a8998f12cb23b42ac996fc33bd772e6ea1 SHA-256: 8d1f0bf8a713dd26c6ad60d9ddb167f20a6368b68f4fdf503fa4c65531ec98ee
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

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=king%2527s+chapel+boston+interior In 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/1/0428/3020/0991/files/71466758026.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/oxford_phonics_world_5_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5123/7032/files/80648296393.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7014/4155/files/wazejilazaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7664/9121/files/pamokalukikojogil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7685/9557/files/venarabogunidonax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/98475583701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/juvuzagilafitezurerofig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/2310/6983/files/59393102013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/vinyl_flooring_reviews_consumer_reports_australia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/malam_minggu_miko_hipnotis_vania_cast.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5641/4363/files/88062168576.pdfIn PDF document text
    • https://4f894aa7-c336-415b-9c58-9d19322b0db8.filesusr.com/ugd/eb6c48_f8c30a7fe8424e118c7d2ef1110ee7a5.pdf?index=trueIn PDF document text
    • https://1dea955a-24a1-479a-a48a-c812fae301a4.filesusr.com/ugd/4f270c_fc2f14fa06ec4b40a08e26ec0393f503.pdf?index=trueIn PDF document text
    • https://4a1cc7bc-08fd-4a76-bc83-66ee71a05c95.filesusr.com/ugd/221eaa_d28c375366134f5fa313d4ac131babaf.pdf?index=trueIn 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_off00007f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2A 5340 bytes
SHA-256: f9aa7f6765f74d0c42228ed9296a04a4e3275fe4612798a7932495ea1a4d8094
font_01_sfnt_off0000915a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x915A 10656 bytes
SHA-256: 7eb8f095f5030622e3bca6bdf00d9ad5d93d83bed989d32334cac9ea030e6e06

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