Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca38f5734263fe4…

MALICIOUS

PDF

47.2 KB Created: 2020-10-26 20:30:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 433f96389d1f8facae6f9469f5fba999 SHA-1: 32e7545d5c35ffb521f44821860529cd27c21919 SHA-256: 2ca38f5734263fe4f9d501fda5595cd192243c1a077dd190699b57279cfd45e7
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'periodic table treasure hunt answer key' and the malicious URL itself, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious URL used in the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=periodic+table+treasure+hunt+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5f939610569c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393883/normal_5f90833de3925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f8c9d061066f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f92ff498fe4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5f90efd955b49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5f927c37a6c3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5f96746d6e846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f9129e22faf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f8bb366a1b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5f96e269bb6a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f9141ba79930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f8ca2178348c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da5acc4-b91e-4f68-a65c-78cfb900b98b/xukipezoxejuniko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff12bb1a-4d25-49d6-a2e0-d487397bd538/55924813515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a40a986-db2c-4556-a221-c8ac02924ab6/riwuvitatizufirigez.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/central_african_republic_conflict.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/beginner_reading_test.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/21907098144.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/escala_cromatica_sax_alto_mib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f37092f-e1bd-49c9-b2c4-8be9df9af973/tupixovemikoxat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565d0aa0-7547-4c40-984e-c2079e97cc79/48909427791.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_off00007550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7550 5424 bytes
SHA-256: de972def5b37d57fbe596b55800f7a6999e9bf8463e174549116f74795844774
font_01_sfnt_off000087c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C3 11708 bytes
SHA-256: 6bd9f40fedbb43b734b9cb6174c8d06209f0fb26772925ac531ed126946ee2db

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