Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7a87db72e6aa53…

MALICIOUS

PDF

45.2 KB Created: 2020-08-17 14:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6027e8367ef35cede351250154d15c4 SHA-1: 9ad1d6be4aa9bde1239b56c19e28c679a920e370 SHA-256: 5d7a87db72e6aa5365631e36acd0c7d6b981ed674e878622af3dd37047ca8679
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a critical heuristic identifying a malicious redirector at https://ttraff.ru/pify?keyword=primary+colour+wheel+worksheet. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The presence of many Shopify links indicates a potential link farm or SEO manipulation tactic to disguise the 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://ttraff.ru/pify?keyword=primary+colour+wheel+worksheet
    • http://files.facepaintingkat.com/uploads/1/3/1/4/131406510/nizorijusiz-zewasupofunosol-mivoz-balobotalibe.pdf
    • http://files.ehrynska.com/uploads/1/3/1/6/131606121/2224986.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/62567543296.pdf
    • https://cdn.shopify.com/s/files/1/0436/2004/0866/files/roredokodare.pdf
    • https://cdn.shopify.com/s/files/1/0431/7711/5810/files/59609685803.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/10_problemas_de_caida_libre_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/keganoremuneferodimobowaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/class_12_cbse_chemistry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/edit_pdf_add_pages_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/24351667792.pdf
    • https://cdn.shopify.com/s/files/1/0437/0982/5174/files/addition_worksheets_with_coloring_for_first_grade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000608b.bin
a4c411c199464978bac7b0dceae79d1b6b0f04b44900f69d44d10f3e7dccaf09
pdf-font-stream PDF embedded font (sfnt) at offset 0x608B 5076 bytes
font_01_sfnt_off000071d4.bin
36119f8b2d1491eb7af6dbba33cc6b92268322edabe5328f6161c9960a350a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D4 12648 bytes
font_02_sfnt_off00009a1e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1E 4324 bytes