Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6b35779c666596…

MALICIOUS

PDF

36.5 KB Created: 2020-11-02 08:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b97b4c1d02c34fc7ec7a60fc825727a SHA-1: 753fc9f4ca519636b773464f5fe189fb4d6031f9 SHA-256: ea6b35779c666596a32889819edeca5eb49a19519dfd13d469e639090001823c
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also flagged the document as malicious. The presence of numerous external links suggests an attempt to manipulate search engine results or redirect users to potentially harmful 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.ru/123?keyword=francis+scott+key+elementary+maryland
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7ade0c88-9eda-464e-a0e8-9e3aa8ad798e/dawusevevujisej.pdf
    • https://uploads.strikinglycdn.com/files/3948e6c8-48c7-4fa7-9d26-d05c57a1a058/pulseless_electrical_activity_ecg_strip.pdf
    • https://uploads.strikinglycdn.com/files/5a7f831f-7dcb-437a-8481-c6b758e1bdef/24682494344.pdf
    • https://cdn.shopify.com/s/files/1/0475/8863/8876/files/canales_ionicos_de_sodio.pdf
    • https://cdn.shopify.com/s/files/1/0500/8844/4068/files/93521668069.pdf
    • https://cdn.shopify.com/s/files/1/0439/9779/0366/files/feature_engineering_for_machine_learning_github.pdf
    • https://uploads.strikinglycdn.com/files/42852538-43c8-43ee-8e73-d402ef3d5ae6/99905166603.pdf
    • https://uploads.strikinglycdn.com/files/764ecf0c-e653-4aaf-b965-6ad3e6d01459/3_tipos_de_lenguaje.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/zoxipig.pdf
    • https://uploads.strikinglycdn.com/files/15ce1ca3-28c9-4025-b371-94fad747c8b8/21386062634.pdf
    • https://uploads.strikinglycdn.com/files/c580ec4c-6752-4e2e-9538-eb95fa5c75d3/21000826989.pdf
    • https://uploads.strikinglycdn.com/files/a1c11591-1cf7-43b2-ac1c-702000a8711d/80228073533.pdf
    • https://s3.amazonaws.com/leguvefu/60429442958.pdf
    • https://s3.amazonaws.com/wizuluworafid/harlequin_great_dane_puppies_oregon.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_off00004fc2.bin
3e27028a9e10bff39ac98cf1ebd0c6dbd01a516a57127f9254c499f82f531ff6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FC2 5204 bytes
font_01_sfnt_off0000616c.bin
e13555f7a6a466244db25a06143ac767d63bbd628ca19bd587cba7f22443d336
pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 10500 bytes