Malicious PDF — malware analysis report

Static analysis result for SHA-256 662499fa1adfaff8…

MALICIOUS

PDF

51.7 KB Created: 2020-07-28 01:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5515a396bf1b766e150cf19a82d34cf SHA-1: bc51cf77559a9d8951b9fd64cbe4a2caccaea2f3 SHA-256: 662499fa1adfaff8875e8278946a4d3369cf7c1a2b4c6ae87daff2920c760522
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains text related to "attorney general forms kenya", suggesting a lure to trick users into clicking the malicious links. The ML classifier also strongly indicated maliciousness.

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=attorney+general+forms+kenya
    • http://files.usasportsassociation.com/uploads/1/3/0/7/130775707/fawirejimivunefefi.pdf
    • http://files.jestbecause.biz/uploads/1/3/1/0/131070309/kuzuk.pdf
    • http://files.studiosirishop.com/uploads/1/3/1/1/131164093/b2e1fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3501/6863/files/63209787775.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/sunagifotevegitafijopowud.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/10284695227.pdf
    • https://cdn.shopify.com/s/files/1/0434/6950/4662/files/62053715941.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2778/files/wasorifubemepir.pdf
    • https://cdn.shopify.com/s/files/1/0432/0244/5475/files/zudora.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/90028364721.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/dawidadazovunavesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3521/3467/files/64652541813.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7162/files/87032988877.pdf
    • https://cdn.shopify.com/s/files/1/0431/9140/2660/files/51741226440.pdf
    • https://cdn.shopify.com/s/files/1/0439/2468/4968/files/16660014030.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_off00008084.bin
50471f5a500a708fd31bad1a90503ddfa14297f31647e505169ed7c17c34d76d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8084 4984 bytes
font_01_sfnt_off00009169.bin
c54418bff7f548b62ec34e1fbbf141b8cde512a891958161857a6845e7db0d58
pdf-font-stream PDF embedded font (sfnt) at offset 0x9169 15864 bytes