Malicious PDF — malware analysis report

Static analysis result for SHA-256 6131858b83d33954…

MALICIOUS

PDF

75.0 KB Created: 2020-10-18 04:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f167943784d9c4b6b25089464106fadb SHA-1: 80f44e1bf06a242c571bb4f6dfcf79671b9535c8 SHA-256: 6131858b83d33954c6ff01b42debd28f96bb78f1633635d7c8fa3feea78fe406
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, which is designed to lead users to potentially harmful content. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector's target. The presence of numerous external PDF links suggests a link farm intended to manipulate search engine results or distribute malicious content.

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://ttraff.club/123?keyword=medicamentos+inotropicos+y+vasopresores+pdf
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f8715fea2b0d.pdf
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f8b30ebe1891.pdf
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f891cd054d28.pdf
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f877fd1a2c09.pdf
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f8b39ba8bfb1.pdf
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5f8aa1979c374.pdf
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f86f8ebebd59.pdf
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f8a2c7db62cf.pdf
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f8708ed62ca7.pdf
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5f8a3e464d1d6.pdf
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f8756ed63581.pdf
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f8b275b1b47c.pdf
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f87195f395f8.pdf
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/ganeb.pdf
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/loposozawupep.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/4041939.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xizaxamuxive.pdf
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/3874285.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4b92f57d-c5ac-40c3-b8ad-ec91d3a5a9c9/29232471861.pdf
    • https://uploads.strikinglycdn.com/files/e61a2590-51b0-48df-9708-ca4ab447a7c8/78070899185.pdf
    • https://uploads.strikinglycdn.com/files/eff4901a-e95c-4383-adbb-f7fe4119e326/46440136523.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e495.bin
2eb1a652d6bae79e2b2382d567f5fd56245ab0a2561966b5a7c9286a4eec1012		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 5436 bytes
font_01_sfnt_off0000f70c.bin
d5d3e833102a1430a6ea6fc5cd71ae930a1fb22f415d37f4ecda9d23be6e2aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 11440 bytes

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