Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e0ff30e5e0e6aa…

MALICIOUS

PDF

45.4 KB Created: 2020-08-01 09:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b42b1782e1ecdc9d08124d14f85df0d3 SHA-1: f0e2cae3eaec75007f0e0b22f2ebd4c7912f88f6 SHA-256: 27e0ff30e5e0e6aa62ebbf2fb011605666bb38fd6e3fa8dbbf93c91937905bc7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=c+header+file+example'. Another critical heuristic indicated a PDF link farm, with many links pointing to Shopify-hosted PDFs, suggesting an attempt to manipulate search engine results or distribute content. The document body itself is heavily obfuscated and contains some of the extracted URLs.

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=c+header+file+example
    • http://files.caitlinmylestherapy.com/uploads/1/3/1/4/131483097/pigiwopexurotop.pdf
    • http://files.gabrielledeveaux.com/uploads/1/3/2/7/132740399/dasegewerugebi.pdf
    • http://files.tonystledger.com/uploads/1/3/1/3/131398380/fubupibev.pdf
    • https://cdn.shopify.com/s/files/1/0435/2232/6696/files/44802699885.pdf
    • https://cdn.shopify.com/s/files/1/0435/2763/5096/files/57657436884.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/miresalobolofakarekij.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/90814904320.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/75584650816.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/72921192202.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/dimadanexafebilifi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8947/files/78376976244.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xewujixamugovaginebutomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64630415929.pdf
    • https://cdn.shopify.com/s/files/1/0440/7105/9608/files/86656709652.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/fudolubipinoxigerugazosiz.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_off000067dc.bin
689b7aa448eaed56af46713258408e4b00fff34653ba1580cb4a06ec69880122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DC 5076 bytes
font_01_sfnt_off000078f4.bin
3192cddec98205e04c6d3c56567788f34011406fcf4fafe30312be499f2fd45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F4 15408 bytes

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