Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cd6634fb6d4563…

MALICIOUS

PDF

47.6 KB Created: 2020-11-04 16:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 72815fcf878a59ee27f021a1923b2771 SHA-1: d6a9cbc2256b767241aa576b7bf4a7e20995305b SHA-256: 41cd6634fb6d45631e3fdf669a57605d2b09266e3527e8806ba6f24d2ddf73e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm designed to distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this file is used to redirect users to harmful websites.

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/strik?keyword=naruto+shippuden+english+dubbed+episode+435 In PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/c7baaf961e7d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5f9fb60773d45.pdfIn PDF document text
    • https://wukemurorafol.weebly.com/uploads/1/3/4/3/134338373/pejemajas_lugewanevux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_5f9e05691e140.pdfIn PDF document text
    • https://xuvarilanagore.weebly.com/uploads/1/3/4/4/134470983/7383058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f87452c60195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f874dc41f476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5f8dc7e720b49.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/07958585-0a57-4eae-9576-7662b905aeba/bavemazawofojeraduxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0319b5d-1cc8-4a0d-94a6-58c2e5192d73/all_cheat_codes_for_need_for_speed_undercover_xbox_360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7011b91-7d64-497c-9ff6-3f22beebe604/11235835199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889e4258-4b73-4f5c-895a-82dff87e3e16/lamukowepemanizudaxalopik.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6400 5708 bytes
SHA-256: cdec883199746ba29d9282fe7d9c73ac077b3e3abe31f82171aebf4f63cab39a
font_01_sfnt_off00007774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7774 10736 bytes
SHA-256: d8635ba7ce92b25c9daee1fbf1d91a4e9329da06bfab1426f6d53ccc6a40f4f5
font_02_sfnt_off00009c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C38 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174

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