Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b9e1f92e9fbb6b…

MALICIOUS

PDF

67.1 KB Created: 2020-08-11 14:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fa8a9918a4675039c3dbaf66944fd63 SHA-1: 3b0afc4477bbbe28f33e97638ff1acd7d6af6af5 SHA-256: 18b9e1f92e9fbb6b39ea77d9225b6bb82c31b800106d2c85d0da0a753082880a
154 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, many pointing to external PDF files hosted on various domains, including a known malicious redirector. This suggests an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous links, including one to a redirector, supports this assessment.

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/pify?keyword=histoire+de+l+orthographe+fran%25C3%25A7aise+pdf
    • http://nojuzewi.roll-em.com/uploads/1/3/2/7/132712615/4157078.pdf
    • http://files.givingasha.org/uploads/1/3/1/3/131398372/winuxabozofur.pdf
    • http://files.bradleyestates.co.uk/uploads/1/3/2/6/132682570/wirifobeje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/fafetidi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0830/9923/files/24574225683.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/29120179399.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/31856642526.pdf
    • https://cdn.shopify.com/s/files/1/0434/0544/3237/files/lonely_planet_japan_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1607/files/litelifufaxabugaxasabozuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/53204085645.pdf
    • https://cdn.shopify.com/s/files/1/0434/5724/9430/files/lonab.pdf
    • https://cdn.shopify.com/s/files/1/0432/4936/9252/files/rebataxevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/97772528399.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/tujigugazepuna.pdf
    • https://cdn.shopify.com/s/files/1/0448/0414/5309/files/oxford_english_to_urdu_dictionary_free_download_full_version.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_off0000c2af.bin
96c1b2c26b9bf36f9bc506a10bdf08a6949a6f1452a1601f7e80ba0a6448e710
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AF 5448 bytes
font_01_sfnt_off0000d527.bin
61e7c906fd3ac0104ec6860967b29a7c1a65cb49b56851dead7334c96349c1d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 12932 bytes