Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23f5da4c527a092…

MALICIOUS

PDF

44.2 KB Created: 2020-08-11 01:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a8e7769ad1e6643b19197c578aa3e1c SHA-1: dcbc229dd4fb86e628154e5dfb0060ef6e554ece SHA-256: c23f5da4c527a092817f45937caa7343806e8c177cc0c5294b0ebd63f7c15ed2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at `ttraff.ru`. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that the embedded links are intended to lead users to 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/pify?keyword=scheduled+caste+project+pdf
    • http://files.greatandsmall.net/uploads/1/3/0/8/130814085/a215517.pdf
    • http://files.smyelectricalcontractor.com/uploads/1/3/0/8/130874316/af42d3e8166df5.pdf
    • http://files.rkives-art.com/uploads/1/3/0/8/130814118/vebepawi-botajupixi.pdf
    • http://fopata.maritimeheritagepress.com/uploads/1/3/2/6/132681482/bd744d76edd8be.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/34962303630.pdf
    • https://cdn.shopify.com/s/files/1/0428/5267/9836/files/archaeology_magazine_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/zigodikojegopug.pdf
    • https://cdn.shopify.com/s/files/1/0439/1524/7771/files/clicker_heroes_hero_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1682/files/file_ti_v_b_li_font.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/devejevetanuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5129/3603/files/20111991668.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fedixudarat.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_off00006d5e.bin
52aaf0b5ad47c14d58589416feeefc5f21115d1798bb4c236505bc100fc7c6f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5E 5424 bytes
font_01_sfnt_off00007fc5.bin
794f6ad6afdd1f2d36a2fa1a4f2b7a4baae4e0d6fa42dff27cd5b9b914166d58
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC5 11020 bytes