Malicious PDF — malware analysis report

Static analysis result for SHA-256 142428e170d3b56c…

MALICIOUS

PDF

50.2 KB Created: 2020-08-31 10:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1edb6486144bdc9b8558f77f1dabdf8f SHA-1: 20fabd46f75e23e29ca5ab99d6ef59b753eb33ae SHA-256: 142428e170d3b56c0cc77573b7d4160cf1ed2d92fc473fd17589c7787a1bf624
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which, https://ttraff.cc/wix?keyword=cahier+des+charges+audit+s%25C3%25A9curit%25C3%25A9+in, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a link farm or redirection scheme. 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/wix?keyword=cahier+des+charges+audit+s%25C3%25A9curit%25C3%25A9+in
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/40266692460.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/65810275476.pdf
    • https://cdn.shopify.com/s/files/1/0430/7619/0361/files/89094943684.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/25805999751.pdf
    • https://static.usrfiles.com/ugd/b8c837_01abae187c814641bd7c5b67a3d3278f.pdf
    • https://static.usrfiles.com/ugd/83f04e_caf221ffbe2940419a713fe480e60299.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d64aeb2fd244f58acb219daefbb57bf.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/20268935566.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/all_of_me_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/14911713424.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/94931155317.pdf
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/20221499973.pdf
    • https://cdn.shopify.com/s/files/1/0471/0134/5942/files/pesinagaxoleboruxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/63956992818.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_off0000786d.bin
8d70b50a521295b310f2c87aee25832864ced57b27af87d3d22d40be80c9a630
pdf-font-stream PDF embedded font (sfnt) at offset 0x786D 5216 bytes
font_01_sfnt_off000089da.bin
ff92043a4a081f30e12f991fb74eb0beb3a69b487ecccee9b5dd63d5a3c6f7be
pdf-font-stream PDF embedded font (sfnt) at offset 0x89DA 16148 bytes