Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e19c9c1f1daf613…

MALICIOUS

PDF

52.2 KB Created: 2020-08-24 20:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfef12d0cabcff364eadc921e2f8e39e SHA-1: 71678b08155e4ef4f140a219fd04b1a977d17f19 SHA-256: 4e19c9c1f1daf61382d842e13c84d49b03fc01025b7feecaa6c96054f2b58d77
150 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its structure containing a large number of external links, a common technique for SEO poisoning or link farming. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=bolet%25C3%25ADn+informativo+ministerio+de+seguridad+2019', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=bolet%25C3%25ADn+informativo+ministerio+de+seguridad+2019
    • http://kuwebiba.keithgriffithssquash.com/uploads/1/3/1/0/131070382/2876877.pdf
    • http://files.driftwoodgiftstofino.com/uploads/1/3/1/0/131070674/wufufifer.pdf
    • http://files.forehandfinancial.com/uploads/1/3/0/7/130775063/fimatifo-dasewereret.pdf
    • http://files.meaghanherstad.com/uploads/1/3/0/8/130814110/6b43507e4e51264.pdf
    • http://files.biohaircarethailand.com/uploads/1/3/1/0/131070378/3e9b1e7f.pdf
    • https://cdn.shopif
    • https://cdn.shopify.com/s/files/1/0435/5702/8001/files/mb_in_a_gb.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/mitizigidabebosefa.pdf
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/lemabuvuzowaginovavojo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1609/3849/files/vadelojipanevarobak.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7700/files/78628968242.pdf
    • https://cdn.shopify.com/s/files/1/0434/5534/8888/files/89469461133.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/zokanajizof.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/28061447055.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/jaxarofikuzoziwalebazedid.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/92858589076.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/34400038418.pdf
    • https://cdn.shopify.com/s/files/1/0429/5757/0207/files/kobaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58829080427.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_off0000892d.bin
9da7f0b89703289b7c35f1bfdb7ddf31a23c604cd8214c8a75d01cecc021d3fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x892D 5872 bytes
font_01_sfnt_off00009d21.bin
ae93aa9ab9f4515160821ce7ae634495c532c61e27ebf80a01a094f8ce807675
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D21 10872 bytes