Malicious PDF — malware analysis report

Static analysis result for SHA-256 b567cb5c8fc7a3d4…

MALICIOUS

PDF

39.1 KB Created: 2020-08-21 16:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18c26d3f36af4793938ec24690cbdbd8 SHA-1: 164a25ef428507855c0c8def23430e38bb9bce09 SHA-256: b567cb5c8fc7a3d4a8054b544cbf95edd4f059e4bf1ee77c8899658b3f1e0675
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=android+police+twitter+flossy', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed 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=android+police+twitter+flossy
    • http://files.pilotsatpenn.com/uploads/1/3/1/4/131407148/ea85edeca47f5.pdf
    • https://cdn.shopify.com/s/files/1/0434/7897/4616/files/vivebin.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/46962657602.pdf
    • https://cdn.shopify.com/s/files/1/0436/4563/2665/files/master_lock_serial_number_crack.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/vibujeviweveliwapapazevaz.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9701/files/history_of_english_literature_age_wise.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/when_i_am_laid_in_earth_henry_purcell.pdf
    • https://cdn.shopify.com/s/files/1/0432/5978/9472/files/katozobazatusakikit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86372263330.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ec2.bin
8908462de11d551eeab38bc9579b8ca338b28443d9517f131a1b0ebc8fccfd0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC2 5120 bytes
font_01_sfnt_off0000704f.bin
dd942901145c78be91376f4b1cab1cf816db555224d945884bc2fd1cb2df3f89
pdf-font-stream PDF embedded font (sfnt) at offset 0x704F 9180 bytes