Malicious PDF — malware analysis report

Static analysis result for SHA-256 67869be7c5d8b5cd…

MALICIOUS

PDF

43.2 KB Created: 2020-08-23 13:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 234851adb20fbfa0fda549b2c392baed SHA-1: 1f54cf7de35c29b9b4014f96a14b57421e9ca324 SHA-256: 67869be7c5d8b5cd3db7c0bd566b31320704ed949590408479746bffdf2119e7
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which are designed to appear as academic resources. The primary link, however, redirects to a known malicious domain, 'ttraff.ru', indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to external sites supports the conclusion of a link farm used for malicious redirection.

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/pify?keyword=article+2+philippine+constitution+pdf
    • http://files.pleasuresilb.com/uploads/1/3/1/8/131871698/tufixisu.pdf
    • http://gowuve.getgobsmacked.com/uploads/1/3/1/6/131637257/sefasinomefejurizab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/nedikawefi.pdf
    • https://cdn.shopify.com/s/files/1/0456/8249/1551/files/46344725869.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/68067185318.pdf
    • https://cdn.shopify.com/s/files/1/0432/4861/5579/files/kobobab.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/tabeximaxunetegerodela.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/wafewipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/98016474170.pdf
    • https://cdn.shopify.com/s/files/1/0438/6743/9264/files/adoption_curve_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/3852/0997/files/towanezalebazoditoguro.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/rexek.pdf
    • https://cdn.shopify.com/s/files/1/0439/4277/2891/files/bayesian_machine_learning.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2934473971.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_off00006cf1.bin
4ebbe37c7f3fec82dbaa9f3af216360cc93d9bde087e797a8c752773955a8249
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF1 5152 bytes
font_01_sfnt_off00007e70.bin
3a64ae801a27aa829a8e4d4fe37041e26728d1871bc9a4e17821d8ac437ea387
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E70 9652 bytes