Malicious PDF — malware analysis report

Static analysis result for SHA-256 856c8385b4050063…

MALICIOUS

PDF

36.7 KB Created: 2020-11-06 11:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5e182a9746ec1526f31ca21dc2b2ada6 SHA-1: ca55b940818519519f6b7b51bd87bbd26f0ac1db SHA-256: 856c8385b405006368daff7addcfcfdf8bceb2e437ef0d4ac9c9975c234d9869
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to link farms designed to manipulate search engine results. One prominent link, https://traffine.ru/123?keyword=ocean+front+property+in+arizona, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect the user to malicious infrastructure.

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://traffine.ru/123?keyword=ocean+front+property+in+arizona In PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/1bf9fe786c5ed4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_5fa0823d4ecb4.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/xanugorude.pdfIn PDF document text
    • https://lusekovipe.weebly.com/uploads/1/3/4/2/134234723/bisokuzifadexesexik.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/1b4df431-7001-4fd5-98e3-6df0096edee7/taros.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/tipos_de_generadores_eolicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f49c43-77da-4ea8-b7ec-ae1a5cccffb5/nurunur.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/tujoganegadilitijidor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d53f86c-5e8e-4865-b24e-a7130396c2b7/dr._james_moohan_ballykelly.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/zumdahl_chemistry_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c0121d-be36-4b2a-bd82-3090144df9b9/94524229620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6510029-8f44-42e6-ad69-b7de2f7bd6e7/81374137924.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_off0000524c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x524C 4976 bytes
SHA-256: 6cf9b1cc61c6fac66e5aa860b65f676d0c14bb18f225d6e8a1ce67a703d3a5a4
font_01_sfnt_off0000635c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635C 10192 bytes
SHA-256: 456b0e5fa7339a761dad747ecfa48f417741f0aacefdb87b87302b5312771322

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