Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a236498e12df072…

MALICIOUS

PDF

43.3 KB Created: 2020-09-17 08:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 18a93d0ab5546e1cdc1fc53436093e21 SHA-1: e24b1446e890c76fc2c5268a5927671c6f3e5019 SHA-256: 3a236498e12df072270d549dd1b10512b906ef294fccf1d7a703d0977875bbbf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, identified as a link farm, that redirect to malicious infrastructure. The primary heuristic indicates these links point to known malicious redirectors, suggesting an attempt to lead the user to a compromised site or phishing page. The document body, though partially corrupted, contains a URL that matches the malicious redirector found by heuristics.

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.club/pify?keyword=primo+water+cooler+troubleshooting In PDF document text
    • http://nijagube.roundbay.com/uploads/1/3/2/6/132682829/kujutejuru-vezagejiwov.pdfIn PDF document text
    • http://joboxuxal.thejoyofjob.com/uploads/1/3/2/6/132682717/tuzopamine.pdfIn PDF document text
    • http://baxixi.taylororrstudio.com/uploads/1/3/1/0/131070054/dogovuxur-zofipipirib.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/1/0430/5240/0789/files/poetry_analysis_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4838/7239/files/96438466543.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6277/1366/files/11724223918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6807/0815/files/java_programming_exercises_book.pdfIn PDF document text
    • https://55216960-c541-451d-92ca-ccb64016f067.filesusr.com/ugd/5de1df_471b846e772f4dc9909e55dfe2e01623.pdf?index=trueIn PDF document text
    • https://db184d31-1b34-4b42-9bf8-4c173b95678f.filesusr.com/ugd/c79b1c_4bce351261344b30b24509bebe51788f.pdf?index=trueIn PDF document text
    • https://4256a9be-ae56-449e-a7d9-f8a185b1cfbe.filesusr.com/ugd/96564c_010d7be90702485686bdf07f4a5cfdbf.pdf?index=trueIn PDF document text
    • https://b03e8a4b-82c9-4f8f-81bc-86e019349987.filesusr.com/ugd/95b9ea_aa0d2f58c9ea4df7aab686d34364cd79.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/71035296388.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/kimulukubosoke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6612/2662/files/tivefigenefukorijubelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/49465695027.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6726/0582/files/58764268482.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_off00006baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAA 5448 bytes
SHA-256: 6e591eefbb17f81b48ad8e60ba58049b24ca20b010347815a66180b292c070cb
font_01_sfnt_off00007e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E10 9960 bytes
SHA-256: c61742bfd4cea8621b50316b99e596b92fac4849125796cbf6a42293d44a99b1

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