Malicious PDF — malware analysis report

Static analysis result for SHA-256 85410aa1ced45da2…

MALICIOUS

PDF

43.9 KB Created: 2020-08-02 00:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02f765439fa0ca119db2dc6e43e65df2 SHA-1: de9b4b99ea8c7002dea80556777b5a4d3c8a6c98 SHA-256: 85410aa1ced45da2e94d0f64e5ab601bc7c5090289f1d5a2b9bec9984658c953
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is `https://ttraff.ru/pify?keyword=rename+file+unix`. The document body, though heavily obfuscated, contains this URL, suggesting the intent is to redirect the user to malicious infrastructure. The presence of numerous Shopify links, while many are benign, contributes to the link farm tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=rename+file+unix
    • http://files.theguardianofnature.org/uploads/1/3/1/4/131453429/najozedunipa.pdf
    • http://files.cmbbodywork.com/uploads/1/3/1/0/131070152/lefutatim_gudumexa.pdf
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdf
    • https://cdn.shopify.com/s/files/1/0431/8534/0580/files/monikisolusodesapabod.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/consecuencias_del_maltrato_psicologico_infantil_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/46223139411.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27247465441.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7791/files/ditetomiwofazijakikar.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/45714195120.pdf
    • https://cdn.shopify.com/s/files/1/0432/9966/8121/files/92492921915.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2767/files/birafojizadopofalut.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/31431402133.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6415/files/6892171032.pdf
    • https://cdn.shopify.com/s/files/1/0437/9826/6016/files/80600055646.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_off000067a8.bin
d18cac75f89ec5f0340b5e1deadf9821da3a619f707f310b21ed945ee5ce7f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A8 4712 bytes
font_01_sfnt_off000077b1.bin
1dbc6ede40774b160f4ea7752c1cc2dadf2a2f3c23c02e4f7764f7f028d812f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B1 13572 bytes

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