Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e93521d5b1bd58…

MALICIOUS

PDF

40.6 KB Created: 2020-10-29 16:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 96143940740e1f97873e4dc6b4209b1b SHA-1: 2fa137d56034d761c08629d9b83cbaa7a55428ac SHA-256: e5e93521d5b1bd584c77c068181bf9a8ce83042d88e2a0c8a92bdfcd0249600b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links and text that direct users to a malicious URL, disguised as an answer key. The primary malicious URL, 'https://ggtraff.ru/strik?keyword=realidades+3+capitulo+2+answer+key', is flagged as a redirector to malicious infrastructure. The document also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt.

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=realidades+3+capitulo+2+answer+key In PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/380238dfea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f9acf512e215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f87864f1eca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_5f9a34b5e80f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5f95c870335bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_5f90cec0e7e3b.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/wemawikivive-koluvabavawe.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/d0264468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/henghuili-files/gewufelunili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7245e79e-1e0a-465b-ab3a-08c1e9de2182/99048508842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0447ea-7f05-45f7-bf9e-da6aa7e7794f/8352001154.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/fenukubozujewejojiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0666778-4a7e-42df-89bf-63545e8704a8/miruwala.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E8C 5508 bytes
SHA-256: 00d9c7b2ffa67c61d7d55eda3408e47179c0a8ddc7571e22fbdab4843f82839b
font_01_sfnt_off00006169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6169 11036 bytes
SHA-256: 5615f20e7de45b96074d8bb753e39df17d02b8973b79326d9720b74e1844af85
font_02_sfnt_off000086c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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