Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de4b373f554323b…

MALICIOUS

PDF

34.0 KB Created: 2020-08-31 01:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2f6b746fa84e93273a48115ee1bada42 SHA-1: 32e20ed5b537b532c870ae589aa66d98c91ea143 SHA-256: 3de4b373f554323bdef5bb791375848cae74bb1f3d1bbdc76ddc23634a27ed6c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm strategy, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious.

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=100+lb%252Fft3+to+kn%252Fm3 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/1/0438/4866/3200/files/jaxunavudewifadudogum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5430/9274/files/gexojazovavexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1179/1253/files/barium_chloride_test_chemguide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/6132/1384/files/gudupado.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2c250_e55d47af05414d398c52ddc4801442ba.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a2f640f340c6440aaa326855df987f29.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0049ca_07ae5382987f44b1b30468ccec732249.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/34ec99_e80a27cc96ac4aa08dd01ddd5fb88ee4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_658b6e5f5b834fbfb7600d6405fdf8be.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b914b5_d20ec9c3e5194e82ae9f6a7a49262b1c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f09a9d_8f0ea6f3bea649e387f9a0c1aaf86c74.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_16bf48bd082c452bb919ec2e4d5c69ff.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_b139f2e832534566ba572c359f306460.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_b072c06d4a21493abc00cecbcca5bde9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5693/8658/files/ralatixabogikumap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0267/4845/files/netflix_android_version_8._1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4578/9606/files/as_one_catalog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3784/3871/files/java_jdk_12._0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000499f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x499F 4932 bytes
SHA-256: d0a693b150b69e5cbc4953fed45a57a616d59c83792248eb46152ddb85c6d41a
font_01_sfnt_off00005a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A65 9548 bytes
SHA-256: 3d72752a5b9a780d8522d06bb28a6fba191ffe6d8a7b40d449b1f8326b40d9a3

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