Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9561c9df8ece65e…

MALICIOUS

PDF

60.7 KB Created: 2020-11-25 14:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fa0d84451be281f88a7dfd2b7951fd6b SHA-1: 9d5c2af7faec559b6058f7220a760dca3e57b32d SHA-256: b9561c9df8ece65e45072f8d0c51b3b4039591b0b97203cc28c20462e27bb64c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF link farm. One of the embedded URLs, 'https://ggtraff.ru/strik?utm_term=eic+worksheet+2014', is flagged as belonging to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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?utm_term=eic+worksheet+2014 In PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/bufolegegebu.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/d19a820c-8e58-4494-abf4-1cb7896685c5/95570132179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce03bd35-2ec0-4693-9d4d-c68a3facab31/46851392412.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/42738799786.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/introduccion_a_la_contaminacion_atmosferica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7712c0-4900-4e0c-ae45-101d59436251/handbook_of_nonprescription_drugs_19th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1bb43d-bcab-4456-98c1-089d773a9ab6/gomimuzokagojifenojikam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6aa048-6f77-45d2-b34c-eab78d3c2bc5/66495116860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9dd3ff0-6da6-4693-926f-395a037c7262/56356005030.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/waxofenaparolitidutubeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a70c46cb-3413-40d4-b80a-32250340ebc5/21154388268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5ad557-7024-43ba-8d36-90eef05202c9/65505074097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a2d104-6e1a-4509-8888-1740a47d45bc/pokemon_diamond_and_pearl_gba_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc117b4-f9dd-4263-8ab8-5045e3240ef9/55565808130.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/dd_towing_boston.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_off0000b395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB395 5172 bytes
SHA-256: 02a8c65e24cdac457f352299fd29286ca6ca8cfbc64de198a7f79527c1e995b8
font_01_sfnt_off0000c550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC550 9604 bytes
SHA-256: c44189493733d63e513396c887fc9dc5900179bcb09194860f9649666c959a7e

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