Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a9f6d563dd8454…

MALICIOUS

PDF

32.0 KB Created: 2020-11-03 06:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5cee9f5d79871f82d51d68e5d4f24ca7 SHA-1: ba9278e09c0b7011c8f34281083a9c5a02f2c49b SHA-256: a1a9f6d563dd84542ae5a0d918a7fa828ef9b74a499f67b9f8a1c5113f00b737
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, appears to contain the same malicious URL and a link to a PDF file. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to harmful content.

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.me/123?keyword=a+list+of+sentence+openers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_5f98a6d04f615.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/9734865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_5f8aa5aa4cf6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxadol/my_grandmothers_house_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7066/7931/files/dnd_5e_expertise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1800/1825/files/dorimog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950b303f-500a-4800-a696-e9466112663d/87908809479.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/50008540545.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3134/3516/files/38539344430.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4573/4568/files/wehrmacht_panzer_divisions_1939-45.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7140/4707/files/rajefutu.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_off0000431d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x431D 4788 bytes
SHA-256: 3384cd8855c7b7d3187e060a17e2b33ddda84075369a6f500553233346a67122
font_01_sfnt_off0000537e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x537E 9452 bytes
SHA-256: f9f758e89a7749aa2ebbb4e643c285d098b2638c332e948ce3e9f9f778ba8882

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