Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e1576ef3b43432…

MALICIOUS

PDF

43.9 KB Created: 2020-08-21 23:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a25164d3704d5fc5f1a80c891b61e584 SHA-1: c250bb18495757c02d61f0b34c9d37c093fa8ac7 SHA-256: b1e1576ef3b43432e95db14cdba71fc70f8c383a4297b55c4e4d4d81bdaeb928
150 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to external PDF files hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=free+act+english+practice+test+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure for a 'free act english practice test pdf'. The presence of a malicious redirector suggests the intent is to lead the user to a malicious site or download further malware. No scripts were extracted from this sample.

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=free+act+english+practice+test+pdf
    • http://files.takemetosavaii.com/uploads/1/3/1/4/131406800/d5016a79e.pdf
    • http://fuzaturi.movebeyondit.com/uploads/1/3/0/8/130814328/237daa245c.pdf
    • http://files.mzapatalaw.com/uploads/1/3/1/4/131437074/jugalofozovokaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/80495913412.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/gologogenamamutux.pdf
    • https://cdn.shopify.com/s/files/1/0437/6798/8376/files/acids_bases_and_salts.pdf
    • https://cdn.shopify.com/s/files/1/0436/6126/3001/files/da_form_5960.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/minugorag.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/jajevaziv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/65568660713.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/natural_biodegradable_polymers.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/bastar_university_change_time_table_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/viral_pathogenesis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/cessna_172_service_manual.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_off00006d49.bin
58e8e7e7aedee78ef8b8494e0cfc1398fdf8b8e7fb19cb56846fedc096792fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D49 5372 bytes
font_01_sfnt_off00007f8a.bin
5c73fa02ca73a728636a6e15c44c033265a47e356c83d47a6a4bcf9d48bfec24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8A 10308 bytes

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