Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8fb1bbec31ffb1…

MALICIOUS

PDF

34.4 KB Created: 2020-08-31 13:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 144b906001afd1a5a2b38d4220ec6db6 SHA-1: e5ccc9d564a1aa33580fddeb4e92b94d1d47480a SHA-256: 5a8fb1bbec31ffb106d0ef6671ef5ee1ffbe50721f751ecf244522e494418bcf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm. One of these links, 'https://ttraff.cc/wix?keyword=new+arkestra+dj+song', is identified as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=new+arkestra+dj+song
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8339/1395/files/great_is_thy_faithfulness_lyrics_and_chords.pdf
    • https://cdn.shopify.com/s/files/1/0457/6752/4518/files/east_hanover_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0460/1351/3889/files/imc_canli_tv_yayini.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/xuvebaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/28435639393.pdf
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/isoflavonas_de_soja_menopausia.pdf
    • https://cdn.shopify.com/s/files/1/0436/2013/9170/files/ti_nspire_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/80291121662.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/39527894110.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/44946485165.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/49510946094.pdf
    • https://cdn.shopify.com/s/files/1/0440/6837/2632/files/kaplan_gre_math_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0462/2788/2133/files/96006519047.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_off00004732.bin
94b614a74fcd0ca5b28f0bf5aba9b8a3e7fb6fec0dd9dd085f893543d6324697
pdf-font-stream PDF embedded font (sfnt) at offset 0x4732 5164 bytes
font_01_sfnt_off000058ed.bin
9fb0ed2c54ff6f2f00747d2db394e3c5a8c1926099d3465b6c2a87e2882e724e
pdf-font-stream PDF embedded font (sfnt) at offset 0x58ED 11484 bytes