Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd0b0176cad9ead…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 10:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d969ded3ce0eba33961d0701e080867 SHA-1: b3ee5ea19bd61cf43efae2a3e70fa55e95feea1c SHA-256: 6dd0b0176cad9eadceff7f752ab631d01a9893cd622814d9a2d132e7d2755a66
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous embedded URLs, including one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves directing users to malicious infrastructure through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/wix?keyword=actividad+integradora+fase+2%253A+diagn%25C3%25B3
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_71be042c184646ac8824a5897df6df64.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d01076753b64e8cb95bf33bb589692f.pdf
    • https://static.usrfiles.com/ugd/ca32a8_2970018c6c3c4676afd51602e7a92377.pdf
    • https://static.usrfiles.com/ugd/ae15ca_82d7b6ff8df34168ad90386ebeb4179d.pdf
    • https://cdn.shopify.com/s/files/1/0432/3255/9263/files/zivoduzomoxevixa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5352/1823/files/sobuzigapemojum.pdf
    • https://cdn.shopify.com/s/files/1/0436/7053/6345/files/93911341807.pdf
    • https://cdn.shopify.com/s/files/1/0428/2158/3014/files/38361261112.pdf
    • https://cdn.shopify.com/s/files/1/0435/5771/6117/files/tewipegivuzexazefini.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5400/files/xujasezevivu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51851907441.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_off00005d23.bin
ec1e0fcfa3d5641b7c84cac41a53d71b4022e84f68d6e8ec2561da0f8b4e0be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D23 5524 bytes
font_01_sfnt_off00006fc2.bin
6cb27c475f390a078ee75d9ecd5372dcc28100cf278559e471663601e2ceafaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC2 10932 bytes

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