Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd1798ea0276b63…

MALICIOUS

PDF

41.6 KB Created: 2020-11-07 00:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7a8a1b92397d324cda69158f288409ba SHA-1: 87756b57ddb6042d9194a98e5fed90f101de5f67 SHA-256: dcd1798ea0276b6334a503b19d47e2bb6cc3db181ef55809d2268e4b4a42b894
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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/aws?keyword=borderlands+2+flame+of+the+firehawk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_5fa34a103c4a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f87a02a306a3.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/0126b0a7-1085-4925-b0fe-6a8af9fc1786/lekoxevelefijuwemubuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde2560c-0053-48f5-b72c-a6ff3f8b75ce/8043060337.pdfIn PDF document text
    • https://jazimosisek.files.wordpress.com/2020/11/textbook_of_general_surgical_oncology.pdfIn PDF document text
    • https://pevejimo.files.wordpress.com/2020/11/tenopegavujanup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7381e4ff-4f6d-4f13-a84c-5ef4c918fe9a/mezumabavoniva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd91101-5610-4b8f-ac21-57d730dc8bfc/64812286986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bccf6696-1022-4bed-8255-5d5b111dbb41/87862352774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4841e113-fbfc-46b1-b1d9-51ece3a125fd/nursing_informatics_and_the_foundation_of_knowledge_4th_edition_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/55726870430.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/fizimobaruweboratiweti.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_off00006378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6378 5484 bytes
SHA-256: 0ff273ae72f97079952663f58b2ecf705912574b5fdea56c25fadacb5e705024
font_01_sfnt_off0000760a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760A 10456 bytes
SHA-256: d018a7e4a4adcb11fb30e209ef2125efe12d79a86cf9a030c05bc540aecbe166

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