Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be48e43e6c232ed…

MALICIOUS

PDF

64.8 KB Created: 2020-11-02 06:34:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 319f69339d79582acc9ba177a56d9b8e SHA-1: 9e62b38284887162c6f288cb1332035d26871ba0 SHA-256: 5be48e43e6c232eda64695009e540a4bb0b5e7993d596751501545c1e0533af7
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics as a malicious redirector. This suggests the primary purpose is to redirect the user to malicious infrastructure, 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://cctraff.ru/123?keyword=animals+in+the+humid+subtropical In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f870a6cc6205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f8af56f8f067.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/cb4e605e-7123-4ae0-b484-0290b1d34621/charisma_sheets_cal_king.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/6631/5714/files/sword_coast_adventurers_guide_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/cane_corso_training.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0793/2091/files/30296162179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3090/4484/files/interfaith_rotating_winter_shelter_davis.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/everyday_use_by_alice_walker_test_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2097/3729/files/clearasil_ultra_rapid_action_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39851380-a12d-4255-a343-171973b37965/18079679922.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/priest_guide_wow_holy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd87b6ac-9c4c-41b0-bd5d-9df89889514f/revarakudivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/senanobumete.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_off0000bd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8B 5444 bytes
SHA-256: af6453d35851c705a9da9a8e4200e0e44bd2fb5a5468819721cf918f40a5b1d8
font_01_sfnt_off0000cfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD0 11788 bytes
SHA-256: a383f557aad9ca75931268c100a3d9abcea07eaa1f2c6fa18adfa28ca2ee63b2

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