Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efebbf4464433e1…

MALICIOUS

PDF

33.9 KB Created: 2020-10-07 23:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ad54d613bf509a6e11f73a308ea50976 SHA-1: be864c2ba2bbc039f20569a5af34d1a51cf468c8 SHA-256: 4efebbf4464433e15002ee88121dfbe9bb705611cb9e6beb2deb4acb58f46650
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file masquerades as a Dungeons & Dragons character sheet, but contains numerous links to external sites, including a known malicious redirector. The ML classifier strongly indicates malicious intent, and the presence of a link farm suggests an attempt to distribute malware or conduct phishing. The document body itself is heavily obfuscated and contains a URL that points to a malicious redirector.

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://gettraff.ru/strik?keyword=dnd+fillable+character+sheet+5e In PDF document text
    • http://sateribuv.twicesmitten-us.com/uploads/1/3/2/6/132682646/wozerelimiru.pdfIn PDF document text
    • http://mipekil.mississippimarkers.com/uploads/1/3/1/4/131438684/3f9391e7a20bac0.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/876c16a0-4179-4a41-a69b-f5b06a2444ed/kowetituxarifat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9fce87-7816-41f3-a4a4-7209cbe82993/badedidunevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ec41d6-4b86-44f1-a425-293cf64aaade/rekoxeninixuvawewiwoxeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8644d0-a933-4f92-bf82-9305ed51f2f0/xalanedare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786dd8d8-67d5-4ddd-bb47-e0a9c69996d2/xobugawebapovumibapon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4daedd-d526-4990-9c8d-aac02a0e6d99/32063169257.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7428/4448/files/paris_tennessee_weather_year_round.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3644/0733/files/word_wise_6_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/the_grain_brain_whole_life_plan_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0290/2946/files/the_makers_diet_food_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3098/9981/files/penn_credit_corporation_legit.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_off000047e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47E1 5372 bytes
SHA-256: e5ac4017dccf2170eaf9a4cae31cdeff183fcc6d75b911aa48d9c9a260fcc930
font_01_sfnt_off00005a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A22 9500 bytes
SHA-256: 10242d74ef25d81514ea935ec043f4300de3a54507ea5218eb89f90cb1979f86

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