Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8cb7de38085340…

MALICIOUS

PDF

42.1 KB Created: 2020-11-03 20:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 01e073d3f78e7bdaab864d8f73cafed8 SHA-1: 1c303767d3ee8fe92378e1ec83ec41dd5c9c2fb2 SHA-256: de8cb7de380853404517fbf2928747d50dba4d4fd7de258f4c5a5e3f09fbd888
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external resources, forming a link farm. One of the primary links, 'https://ttraff.com/123?keyword=lathander+5e+weapon', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other URLs that appear to be part of a link farm strategy.

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://ttraff.com/123?keyword=lathander+5e+weapon In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f87326062379.pdfIn PDF document text
    • https://sukanogijero.weebly.com/uploads/1/3/4/3/134333185/484735.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/3cb113af6.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/42cad94f-d131-425e-9376-7cda3296be0a/24231599840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de3b8b8-afe6-4490-9c08-3d98bedb9160/92996059582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e023c5-3cf6-426a-8c71-ac373f5fbfc8/magicjack_plus_troubleshooting_no_dial_tone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09657f9-1f32-4bc3-97ae-dfaf50a6356f/semi_log_graph_paper_for_sieve_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/tattooing_a_to_z.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f10e09-36c9-4eda-b1f3-63d7324416da/tazologetegenade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ee152f-5570-4bcd-8a69-dc4010ffe45f/ruzijedefajofanerorajajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea76f46f-7e19-4289-a0b9-3f17bb24480e/60327927627.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/bobby_dassey_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565e5ad6-3695-45cd-8941-042bb95ae2f7/10909859612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82486b33-afbc-433b-8bfb-461faea51e12/vonobalo.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_off000064d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D4 4992 bytes
SHA-256: a51079b2d77811957ed9aefed124c6c8e906c4cc3a547ea94e5ba468f9f30dbf
font_01_sfnt_off000075e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75E3 11348 bytes
SHA-256: 9e3a69998b7163aa0af73818ab1b785ef8d4b3efee797dafc6ecf3c386bc3e90

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