Malicious PDF — malware analysis report

Static analysis result for SHA-256 b521cf7bfee655d9…

MALICIOUS

PDF

34.2 KB Created: 2020-11-08 07:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 957c65851cba1bf8e8170113bf370b36 SHA-1: 12ab3fbd42cc23988762bacb40e3d5e71845bb7e SHA-256: b521cf7bfee655d9d6e9bcdc155cb2d801078b105ebd58eba7103a6fda960c00
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://gettraff.ru/123?keyword=heart+banner+minecraft+crafting+recipe'. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is 'https://s3.amazonaws.com/gupuso/76254696085.pdf'. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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://gettraff.ru/123?keyword=heart+banner+minecraft+crafting+recipe
    • https://legobunisazej.weebly.com/uploads/1/3/4/5/134501617/vasotuxuzana.pdf
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f88af203e8f0.pdf
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f92556d95fd3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gupuso/76254696085.pdf
    • https://uploads.strikinglycdn.com/files/1bb9cb6f-d1cb-44c6-8f9b-042b83c653bf/23243551296.pdf
    • https://s3.amazonaws.com/jusuberu/82903215211.pdf
    • https://uploads.strikinglycdn.com/files/0cdb541c-b5c0-4295-8987-03b8d6657bb3/tamimobekejito.pdf
    • https://poxijotavix.files.wordpress.com/2020/11/phet_balancing_chemical_equations_simulation_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/9d1e2f0b-62de-43c2-8199-7c741c1ea2cc/xapijobisepotipolawonufo.pdf
    • https://uploads.strikinglycdn.com/files/4be1a36a-a6de-4520-a5c8-614d2408a476/87993539710.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_off00004722.bin
c86e83eb222a91b263c005a3dc56c0abe17b68a63654e0ae879c77af37d03b78
pdf-font-stream PDF embedded font (sfnt) at offset 0x4722 5228 bytes
font_01_sfnt_off000058dc.bin
ff4a8a40d4e65d0a95ae88b9d5d10dde6d08cb1d56c56387f6a4de23f09eb2c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x58DC 10360 bytes