Malicious PDF — malware analysis report

Static analysis result for SHA-256 2666fd54065d908f…

MALICIOUS

PDF

51.0 KB Created: 2020-08-16 00:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a71b1427162adcc4bb189b9f143311e4 SHA-1: 197f35e67851bdebc67182ebac5e6e6b870b8c4e SHA-256: 2666fd54065d908fe1563385eb2b36449e8f71c5a03c4d6b178564c9c711affc
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, many of which are presented as book PDFs, but one prominent link redirects to a known malicious domain. The document body, though heavily obfuscated, contains the text 'Cardiopulmonary physical therapy book pdf' and the malicious URL, suggesting a lure to trick users into downloading potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=cardiopulmonary+physical+therapy+book+pdf
    • http://gitula.walnuthillmennonitechurch.com/uploads/1/3/1/6/131606027/37be999.pdf
    • http://bolilej.warwyckitsresearch.com/uploads/1/3/0/7/130775795/25c12a7fe0152.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/zuxigitilowojedetax.pdf
    • https://cdn.shopify.com/s/files/1/0439/0119/0299/files/bujanabasatarifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6413/9669/files/35235779530.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/tool_wings_for_marie_pt_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/2374/4674/files/84511270807.pdf
    • https://cdn.shopify.com/s/files/1/0434/3001/9237/files/galorenakokezesegaka.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7475/files/washington_manual_of_outpatient_internal_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0438/0108/4064/files/asian_countries_and_capitals_and_currencies.pdf
    • https://cdn.shopify.com/s/files/1/0446/9896/0026/files/create_fillable_form_without_acrobat.pdf
    • https://cdn.shopify.com/s/files/1/0436/1145/5645/files/74383977593.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_off00008938.bin
a57e05172d1f757dfe6948d468be655b9d666028dc39fc1cd9c62d786ab6bcc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8938 5608 bytes
font_01_sfnt_off00009c1e.bin
0008eeedcab9eb8b535c009dce01005f31479522901d7d79d7eb9dd25f7a1518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C1E 10252 bytes

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