Malicious PDF — malware analysis report

Static analysis result for SHA-256 3816f6318ca50615…

MALICIOUS

PDF

44.0 KB Created: 2020-08-16 23:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b36a7083d5ba10bc06d0f7197f158ec3 SHA-1: 1ee7991687cb07722c12fc0c6490c904d79f5cac SHA-256: 3816f6318ca506159c7e955c6e62cf336cdfd8c4f5bb685e017f048e4af1958c
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL disguised as a search result for 'Bluestacks 3 for windows 7 laptop'. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack. No scripts were extracted, limiting the analysis of the attack's full scope.

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=bluestacks+3++for+windows+7+laptop
    • http://files.gavinwelshfarriery.co.nz/uploads/1/3/1/4/131409761/jobewirerujofafi.pdf
    • http://wolare.economiczhang.com/uploads/1/3/0/7/130739415/vepudikexizis-durukuxewituteg.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/95987000239.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/3974461122.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6927/files/68854875917.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/c_language_programming.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/cpu_temperature_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0436/3023/1712/files/vinevobevodes.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/14262774438.pdf
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/2152356874.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/famunezon.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/mitosis_stages_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0433/5478/3893/files/tekuduz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8680/7201/files/90541081409.pdf
    • https://cdn.shopify.com/s/files/1/0433/4547/7783/files/42824822460.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/siguwumopikaxufux.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_off00006cda.bin
921f1bff27ae1cd441279bc4a5604985344866ea7a3eed63081f4a7dd3e78791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDA 5600 bytes
font_01_sfnt_off00008008.bin
4aaeed09e1414484a03db5b5cd82e9e333d5b2caee788904be4d5356d703a022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8008 10280 bytes

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