Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e961120820c8af…

MALICIOUS

PDF

38.2 KB Created: 2020-09-30 16:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 60907ec39aa18b69335ac562d1c94960 SHA-1: e769c759112f8f149e74162e880db4a786ce61bc SHA-256: a8e961120820c8afd73d156a85c44293655be4faa71e3baf87fce9ca1fc23045
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://cctraff.ru/strik?keyword=charan+das+chor+play+pdf, which is likely intended to lead the user to a malicious site. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious 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://cctraff.ru/strik?keyword=charan+das+chor+play+pdf In PDF document text
    • http://timixaba.badscuba.com/uploads/1/3/0/7/130775455/820007.pdfIn PDF document text
    • http://files.thehnossaproject.com/uploads/1/3/1/3/131380717/b8aa49785425658.pdfIn PDF document text
    • http://files.maroevich.com/uploads/1/3/0/9/130969080/gonedatulol.pdfIn PDF document text
    • http://jezuwup.feedmeupdelivery.com/uploads/1/3/0/8/130874473/4470bc49eb1.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/1/0482/4956/9434/files/maze_runner_brenda_death.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6576/4761/files/metodos_de_separacion_de_mezclas_homogeneas_destilacion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/33812980970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/420f8d50-4b85-4447-baba-38b25184561b/70664211418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2e87ed-9aa9-4fd3-adc6-aa57101765d0/jolisulozonomagufafibajef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7537/1159/files/pakuradafarugagena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/95895437142.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2670/1718/files/czardas_alto_saxophone_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/popusuvudaju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4713/1035/files/zetosoronazosimikupatuma.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_off00005689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5689 5248 bytes
SHA-256: 8daf791c19d2b595dd89e08bdd43ebdbc8bf86502263342369f9fe7a7a67892b
font_01_sfnt_off00006866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6866 10376 bytes
SHA-256: c2b6a01e43f028494273dc9c6cfa3824b83c5a87e184b96319c0845d07e11574

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