Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a0ac8823887719…

MALICIOUS

PDF

34.6 KB Created: 2020-11-03 10:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a90cd6d4fbd5b17924f238102a65e249 SHA-1: 19ba22017f37fa0060bf50373ba8df07ad0506a8 SHA-256: e0a0ac8823887719e70a8d7c2cb087cd7018db1338eaefb172c583ca46f5efc2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious behavior by containing a large number of embedded links, identified as a PDF link farm. One of these links, https://ggtraff.ru/aws?keyword=kearsarge+regional+high+school+calendar, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of these links to redirect users to potentially harmful content or further malware distribution.

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://ggtraff.ru/aws?keyword=kearsarge+regional+high+school+calendar In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_5f977afadffe4.pdfIn PDF document text
    • https://disanelazutiwi.weebly.com/uploads/1/3/4/3/134361230/zatuwadefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_5f9013e60ad1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f98cd46e8f5b.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/vavowuw_mejib.pdfIn PDF document text
    • https://kearsargehighschool.bigteIn 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/f2b54f25-a81e-4b9b-bf05-b13d846d3124/keduboretoninub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8197/1908/files/xofewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322b3e40-1562-452d-b4f5-baa666e35bdf/95961806564.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/2386/8319/files/the_mousepad_yuku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8075/1006/files/likugidometefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac312500-3121-4d04-8971-e47eff586a59/69580584557.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/3326202660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/733d61f8-bc46-4d5e-8816-3861e84fea5a/65211978619.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3892/3169/files/descargar_csi_las_vegas_temporada_1_latino_mega.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1746/9086/files/77124093288.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_off00004900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4900 5172 bytes
SHA-256: 7ce357a9654389f7747a5d2d5b5a6d39480d6f5fc1465bc7d5a8210f38028f94
font_01_sfnt_off00005a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A92 10204 bytes
SHA-256: 3e179a8e38a1fafea8b3ba273c3c2168602ec3a3f89b29ef2ece1cc5af50ced3

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