Malicious PDF — malware analysis report

Static analysis result for SHA-256 866cbd9bd907dfe5…

MALICIOUS

PDF

112.8 KB Created: 2020-08-05 06:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1971ca0cc5199480ed63cd0c8b98e8b0 SHA-1: 39cc29eb261e656b8d3adda9fa10a6d9455ed93c SHA-256: 866cbd9bd907dfe5adbae2ee78da647a181d3fc3ce7737365a76ec9829b110b0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=afrikaans+taal+pdf'. This suggests the document's purpose is to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

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.com/pify?keyword=afrikaans+taal+pdf
    • http://files.thecotswoldsgentleman.co.uk/uploads/1/3/2/3/132302940/b0d74.pdf
    • http://files.cuestacollegerodeo.com/uploads/1/3/1/4/131483550/f518ae417.pdf
    • http://files.ellvenus.com/uploads/1/3/2/8/132815318/de077f64869c.pdf
    • http://pabifino.phastudycenters.org/uploads/1/3/0/8/130874197/texiwodin.pdf
    • http://xudude.kodiaksfirearmtraining.com/uploads/1/3/0/7/130739564/jonefepulatifalufala.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/rezuvezogokovesekavarekow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/wufuxel.pdf
    • https://cdn.shopify.com/s/files/1/0430/2517/0595/files/ritijof.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0074/files/kagakumaje.pdf
    • https://cdn.shopify.com/s/files/1/0448/4320/4765/files/calendario_escolar_2020_a_2020_sep_para_imprimir_en.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/garixuseja.pdf
    • https://cdn.shopify.com/s/files/1/0435/8556/8923/files/torujopapizubiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5503/files/satodozumebatewox.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/89590618051.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/12522124507.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/kefesup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/69387462506.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b18.bin
78b687022675b68b5bd8b806f45d2676c41406151426179662986bb244b004fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B18 5088 bytes
font_01_sfnt_off00017c7c.bin
710dda848beb160bd2722e1bbc48390d0f5bb7aa8749fa0a9cb532ce0f304cfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C7C 19288 bytes