Malicious PDF — malware analysis report

Static analysis result for SHA-256 b782d02d19ebb0ac…

MALICIOUS

PDF

34.0 KB Created: 2020-08-15 00:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a40ad0d50076200e05f27856c462b18d SHA-1: 1af7da4f419aa04f7a42bdcd239d556c1004ebec SHA-256: b782d02d19ebb0ac3204d84570a5f4dbb5db2f1af43019b8e86b9489e92ad46c
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external resources, forming a link farm. One prominent link, 'https://ttraff.ru/pify?keyword=north+ayrshire+council+housing+application+form', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to a housing application. The ML classifier also strongly indicated 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.ru/pify?keyword=north+ayrshire+council+housing+application+form
    • http://files.rcrequestrian.com/uploads/1/3/0/7/130740149/japejejev.pdf
    • http://goxawuvas.lukecmartin.com/uploads/1/3/0/8/130813528/ruvimog_vubopu_mosil_wifofuxelova.pdf
    • http://files.plant-miner.com/uploads/1/3/1/3/131379833/9735485.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/dragon_pickaxe_osrs_ge.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/36402645876.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/gagedimif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lejozusuxawunulimedobina.pdf
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/concrete_batching_plant_operation.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/97180758612.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/99628678892.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/zobudimorunen.pdf
    • https://cdn.shopify.com/s/files/1/0448/1895/6449/files/mizodawezeboguzurupug.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_off000044c6.bin
46f07cc05993658e47ef27af76be73a30a6b6450fd20eaaa17a4a4ab3c1bd650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44C6 5500 bytes
font_01_sfnt_off00005768.bin
517cf146b47c5d9c8521795fc9d9e689d1cccf1b412e7ddd878e5446f7e4d166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5768 10432 bytes

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