Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d15b2d7ed7b8d0b…

MALICIOUS

PDF

68.4 KB Created: 2020-10-12 10:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: de93e276e530441da5d8953a9d3b9d90 SHA-1: c7d42ecd89a99f8f9ea0efacd8a9e2a734874b69 SHA-256: 4d15b2d7ed7b8d0bb0e810f3b56ba1c944f523d5518bff4fd13f73cd14da4f23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ggtraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning and traffic redirection.

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=jacobian+transformation+example+pdf In PDF document text
    • http://files.180degreefinancialcoaching.com/uploads/1/3/1/3/131379828/newuvarojusi-gagapubaguzoja.pdfIn PDF document text
    • http://xujoruja.councillorpetrie.com/uploads/1/3/0/7/130738526/gonifireganuba.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/a91ccd6a-ffc7-41dd-897b-43d402338dab/bifebaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/059ebf14-5d5c-47d8-b8c1-c93300a1d5b1/gaxipukesuvajuwusex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c42f30-9e0e-4623-96e2-e57648a38163/72657774396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae3204a-7103-4b7f-92a1-d387c8ba84c6/pitetakiwanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1acb2749-a843-4b12-a4b1-29d43e49fc3c/57578943506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0552fab4-edc8-4d64-92ca-a72c4480d161/19294343893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6495081-c97a-4328-a658-ef6eef998a02/gobudajomakumamoxomewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e505fb4-4ff3-47fa-80d0-7389696af11e/33376668641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a00cedd9-dddb-4984-8060-854d440c6013/jupenag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23aac302-6bb7-4114-b565-8cbc22b86fd2/dutanarumegisezup.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_off0000a330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA330 5496 bytes
SHA-256: 362ce9b21cca3bfe34bda7b4f027eb64e8565e88fa7e8780894ae539ff2a2674
font_01_sfnt_off0000b5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B9 17472 bytes
SHA-256: 371e206ab0f737a1ec47b8123c5335dd4d13cb8f8554d21ea5f7779e24aa396d
font_02_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 16628 bytes
SHA-256: 4ae82a7626e64216cd87601bbbfe1916cea603f9b054fd14490fd53e013d59eb

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