Malicious PDF — malware analysis report

Static analysis result for SHA-256 78106184ce28f49b…

MALICIOUS

PDF

42.9 KB Created: 2020-10-06 12:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0c95fa872a3d204b56433d06ca2dc37e SHA-1: 79fe86bf25c46eb1d8a940934e8595fc3e3ed487 SHA-256: 78106184ce28f49b15417b4d02389d843eb3799295af00b03523b6bc79148489
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Selenium robot framework installation setup guide'. The presence of multiple external links, many pointing to benign-looking PDFs on strikinglycdn.com, suggests a link farm or SEO poisoning tactic to drive traffic to the malicious redirector. The ML classifier also strongly indicated maliciousness.

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=selenium+robot+framework+installation+setup+guide In PDF document text
    • http://files.fuzzyudder.com/uploads/1/3/2/7/132710797/3652436.pdfIn PDF document text
    • http://files.acast.dk/uploads/1/3/1/3/131384373/vifilakufibadomax.pdfIn PDF document text
    • http://pafubesel.alexandrahaleyart.com/uploads/1/3/0/8/130874679/2381894.pdfIn PDF document text
    • https://site-1036900.mozfiles.com/files/1036900/tutalutivo.pdfIn PDF document text
    • https://site-1038578.mozfiles.com/files/1038578/52296522212.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/e98aff7c-c8e1-4cad-b4f3-c75e033afd4b/96521417658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc769693-881b-48b4-a740-5363750812db/zukolipixamebijexuxuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a7bde3-03c8-4f84-a40d-88b13736986b/68935621355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6aa7df-b5e5-4edc-b5ac-66790f050969/natidagenode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f495769c-7509-4818-91ca-8f83ba5194b4/59320594951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d8902d-9c72-44e3-a7e8-885d688b010c/66555939123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc764ba-1a26-4037-a75c-0946e7917a3a/59083532540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7e4aa9-15ec-4062-83da-e3014ba2f454/gujokinov.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_off0000669d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x669D 5760 bytes
SHA-256: cc45a9796123b86a53202c6182488c2cc59810b4492c9bbcf7d164b5ae58a630
font_01_sfnt_off00007a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2F 10636 bytes
SHA-256: f3c35d1162dbe615fcb0c8a82298b8f9fa70d05a657fc019c28487d6182d460b

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