Malicious PDF — malware analysis report

Static analysis result for SHA-256 27350efabd2f7f78…

MALICIOUS

PDF

36.1 KB Created: 2020-07-28 19:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 987719919706f07c7c1bcf01aa102ac7 SHA-1: d3397ca9bc203a453f170ce3c39a6d40f55c27b9 SHA-256: 27350efabd2f7f781462dc0c9a47effa47aef27eecbfda52776325be024dd768
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large farm of external PDF links. The primary malicious link points to 'ttraff.com', a known redirector. The document body is heavily obfuscated, preventing a clear understanding of its content, but the heuristics strongly suggest a lure to external, potentially malicious, resources. The ML classifier also provided a very high score for 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.com/pify?keyword=peacock+audio+sound
    • http://files.eastlondonkempo.co.uk/uploads/1/3/1/3/131378899/rusobilu.pdf
    • http://files.sharpnutrition.net/uploads/1/3/2/7/132741181/sibezus.pdf
    • http://files.susantregoning.com/uploads/1/3/0/9/130969166/gamunerujubowe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/48196024246.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9831/files/5651788685.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/27053988726.pdf
    • https://cdn.shopify.com/s/files/1/0433/6123/9192/files/9910962811.pdf
    • https://cdn.shopify.com/s/files/1/0438/4443/6128/files/54089056605.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/rabide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/zojusoxawimexuveguzese.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/jomagodasomik.pdf
    • https://cdn.shopify.com/s/files/1/0437/8394/6397/files/13049478423.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/suder.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/fodupabofunuje.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/
    • https://cdn.shopify.com/s/files/1/0432/319

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052d6.bin
f6e0325d84573751de068999349122ab1f39793ee4f62b154990125ab9dfd48f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D6 4672 bytes
font_01_sfnt_off000062b6.bin
e99a5373da96995615bf9fa5ba60aa8fc8f0fa552ca26d65c87967d73837b3eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B6 9620 bytes

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