Malicious PDF — malware analysis report

Static analysis result for SHA-256 6243754248931824…

MALICIOUS

PDF

43.9 KB Created: 2020-08-11 11:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ca97fa1d738adee6ec2df8fca511f5d SHA-1: 37e812a6f7acb03ec66472d071ce23c9f5264243 SHA-256: 6243754248931824994c4a9d5dbc0ad86c570c97e10f424c1a6061f4037e40a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or redirection scheme. The primary malicious URL identified is https://ttraff.ru/pify?keyword=voyelles+arthur+rimbaud+pdf, which is linked to known malicious infrastructure. The document body itself is heavily obfuscated and contains many embedded URLs, further supporting 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=voyelles+arthur+rimbaud+pdf
    • http://files.nenadmarkovic.net/uploads/1/3/2/7/132712116/38fabc673b.pdf
    • http://files.feelingsfitness.com/uploads/1/3/1/1/131164168/vijixugutitiruva.pdf
    • http://files.maurajlecturer.com/uploads/1/3/1/0/131070152/tufoxulu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/kigox.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/latest_malayalam_movies_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2890/6138/files/30895636467.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/92218601939.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0430/5145/0519/files/the_boyfriend_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28391359898.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/topidola.pdf
    • https://cdn.shopify.com/s/files/1/0438/2271/0941/files/bomolesedivub.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/36867196358.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/netiferer.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/67447161842.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_off00006d2f.bin
743c00ca7716fe5028053fcae8597c4a7155b83e9e2509d4ac40ebab9835362b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2F 5488 bytes
font_01_sfnt_off00007fb7.bin
b30cdefc653a00a82d6aa65682e7c286dad5f29130d4a5a384cc9c6455e34ed2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB7 10336 bytes