Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bd9a546fd04e2c…

MALICIOUS

PDF

42.3 KB Created: 2020-10-28 13:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6807858226c32a6142ec19ff1e5d5923 SHA-1: 183b4f36883ccf0829f9c19333c12bd446d7a59a SHA-256: 18bd9a546fd04e2cc40f733299d0f7bfe39e27a3546acc98d6c0c4872aae26c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, many of which point to other PDFs. One of these links, https://ggtraff.ru/strik?keyword=fire+emblem+randomizer+rom, is known to be malicious redirector infrastructure. The document body contains garbled text but does include the malicious URL and several other PDF links.

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=fire+emblem+randomizer+rom
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8bb5131de42.pdf
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f87442bd01f3.pdf
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5f95dec3a4125.pdf
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f9718b7e3378.pdf
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f886a6a5c778.pdf
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5f8d0d2462943.pdf
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5f91b04ca62c7.pdf
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5f9790f695224.pdf
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f92645de3e13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/86930836644.pdf
    • https://uploads.strikinglycdn.com/files/62b436c9-cf42-4619-a06b-8d06c20ee01e/42460607401.pdf
    • https://uploads.strikinglycdn.com/files/a8bb7bba-9caf-461a-a8a1-b909005ba823/san_ramon_unified_school_district_special_education.pdf
    • https://cdn.shopify.com/s/files/1/0502/9661/9193/files/esl_object_pronouns_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0501/5604/4469/files/rimef.pdf
    • https://cdn.shopify.com/s/files/1/0484/2369/8584/files/pozupezorutol.pdf
    • https://uploads.strikinglycdn.com/files/0a8ff62b-26d1-4148-9066-1c3ccb36aa8c/jujirep.pdf
    • https://cdn.shopify.com/s/files/1/0481/8049/4485/files/lepozevimutonezogide.pdf
    • https://uploads.strikinglycdn.com/files/e5313697-0357-4ce0-89bd-ae2412b1ecf9/wish_fulfillment_theory_ap_psychology.pdf
    • https://uploads.strikinglycdn.com/files/27f78d5b-ec6e-47ff-a3c3-9c1c49198f46/rimurunabozebawov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b0.bin
f6d0b3d184238f4bde79d87f252cab95181f0e74336eca6cee1377a6d036a1a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B0 4936 bytes
font_01_sfnt_off00007861.bin
907c35837260837438b7f0d4e81ba851c9fc45c4fae776c7abb83a80e9095a1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7861 10452 bytes

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