Malicious PDF — malware analysis report

Static analysis result for SHA-256 159cae34aaf835fc…

MALICIOUS

PDF

44.6 KB Created: 2020-07-28 09:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3a09fd8947bc254a3d5d2274a0571ba SHA-1: c0fce32dca0e11afab6a50ff127523e2ae3e1a09 SHA-256: 159cae34aaf835fc638c9666ba9f63668eb124e077c29981a0cb3f5d575e8f9a
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is likely part of a phishing or scam campaign designed to trick users into downloading malware or visiting malicious sites. The presence of a 'download button' lure further supports this, suggesting an attempt to exploit user trust for malicious purposes. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=google+pdf+to+word+converter+gratis
    • http://files.empowerunit.org/uploads/1/3/1/3/131384468/lozapiwo.pdf
    • http://files.investphilippinestaiwan.com/uploads/1/3/0/8/130874160/ketubuzos_niwuxum_sejelekevibe_poveto.pdf
    • http://files.canal-art-by-julie.co.uk/uploads/1/3/1/4/131438240/3298022.pdf
    • http://files.gas-engineer-training.co.uk/uploads/1/3/1/4/131409037/4417561.pdf
    • http://files.theculturedmushroom.com/uploads/1/3/2/7/132710497/109cc87599b62e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/59740231208.pdf
    • https://cdn.shopify.com/s/files/1/0432/7948/3044/files/sunex.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/72065134665.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/68464699058.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3414/files/tujosajorikajida.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/depifekewusukatabija.pdf
    • https://cdn.shopify.com/s/files/1/0436/0205/1235/files/kenuwediwozawipaxatopizit.pdf
    • https://cdn.shopify.com/s/files/1/0432/3924/3931/files/4784391094.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/sobup.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/38292797901.pdf
    • https://cdn.shopify.com/s/files/1/0438/9722/5368/files/70806784967.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/41383536469.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_off00007099.bin
91c5dbccf4285fd8aaf72e18612a6a3cb546d95960a481cbde57f3fb02e800c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7099 5292 bytes
font_01_sfnt_off000082c3.bin
f3a561f70061e7eb1cbf52d490c72ec81f516a712e9cccc94c60f1f5fcea1af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C3 10052 bytes

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