Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d72b6dc4a21e9c…

MALICIOUS

PDF

62.6 KB Created: 2020-11-03 21:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b70144f21f1f38f651253e777e7f51ad SHA-1: 1bdfb965a088b70042c2ab40ee3142df3f7458a1 SHA-256: 41d72b6dc4a21e9c9b4c71d1cd11a2b53393809d30ed29ff40189ab0af2a349b
154 Risk Score

Malware Insights

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

The PDF contains a lure related to a 'snake respiratory system diagram' which, upon clicking, redirects to malicious infrastructure. The PDF also contains a large number of external links, many pointing to PDF files hosted on link farms, indicating a potential SEO poisoning or traffic generation scheme. The ML classifier strongly flagged this PDF as malicious.

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.link/123?keyword=snake+respiratory+system+diagram
    • https://jivarogogujuno.weebly.com/uploads/1/3/4/5/134513891/d7deb16ba.pdf
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f89ac3d0e5e4.pdf
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/861c18e.pdf
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5f91543c56253.pdf
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5f9479c36af5f.pdf
    • https://bolefapazudakaj.weebly.com/uploads/1/3/4/4/134478960/2543d4b2b7046.pdf
    • https://cdn-cms.f-static.net/uploads/4410953/normal_5f93d45a3acb3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/82e3122c-920a-4506-8ed0-606fa3587593/71593148877.pdf
    • https://s3.amazonaws.com/susopuzupure/rewezugaxijotim.pdf
    • https://uploads.strikinglycdn.com/files/4a49ab76-d883-479a-bcda-e5deb2f8e00b/69220182803.pdf
    • https://s3.amazonaws.com/lekizopiloref/84331099212.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_off0000b6e7.bin
a6c868d31f6bfb4fca4c1205e3dc0b05dae8183f9156ba01c6a366182bf6fdad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E7 5516 bytes
font_01_sfnt_off0000c99d.bin
94cddcff2d09e3bdc8ec2eeac3dd1d73e3568422fb974f992946d2ad48e55fb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 10564 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.