Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a744b34b36f761f…

MALICIOUS

PDF

45.8 KB Created: 2020-08-06 15:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3016fbb8bad6c25b52511fbfb102856 SHA-1: 1de149a6be08441f52d4732b71c08b366bc9db1a SHA-256: 7a744b34b36f761ffd2fa7bd6db3c8073f718822d1d0599e8a4def15e450ae84
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, `https://ttraff.cc/pify?keyword=dipleurula+concept+of+origin+of+chordates+pdf`. This suggests the document is part of a link farm or SEO poisoning campaign designed to trick users into downloading malicious 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=dipleurula+concept+of+origin+of+chordates+pdf
    • http://files.snowsbendfarm.com/uploads/1/3/2/6/132681694/42f7418.pdf
    • http://files.wooddragonadvising.org/uploads/1/3/2/6/132681062/1373169.pdf
    • http://files.mi928.com/uploads/1/3/0/7/130776295/nojixemipejokupokud.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/80401424826.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/nugujesisixulobulebivori.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6773/files/pukejitiladekos.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/73928871575.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/novorubafiwani.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/1485483374.pdf
    • https://cdn.shopify.com/s/files/1/0430/3562/3578/files/dasep.pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9668/files/bungsaufgaben_ableitungsregeln.pdf
    • https://cdn.shopify.com/s/files/1/0430/9296/7581/files/jofif.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/vadurapokezum.pdf
    • https://cdn.shopify.com/s/files/1/0435/1783/7467/files/xagas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4892/files/betuwavetuvunilobavem.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2325/files/texux.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_off000074d9.bin
7d6660fa036d5a3c39eeca432eb06481c2367e9e392ba414fa5ee25ef9181e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D9 5416 bytes
font_01_sfnt_off00008741.bin
0a48365655dd2fb4648d5558d0deab5bb60e965aa410dc510b0d4386c3419f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8741 10248 bytes

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