Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb838f222e0006cd…

MALICIOUS

PDF

47.3 KB Created: 2020-07-28 11:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b796cacd5896c9a9afc71a069b9bb37a SHA-1: 059b59303d96fa9adcfe0bcca6da31fca421b7bc SHA-256: eb838f222e0006cd1a46846a11c299a773cfc7e5b8da0751646ae80996f59f54
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=asrock+z77+extreme4+overclocking+guide+2500k, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain metadata related to the 'asrock z77 extreme4 overclocking guide 2500k', suggesting a lure to entice users to click the malicious links.

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=asrock+z77+extreme4+overclocking+guide+2500k
    • http://files.oubria.com/uploads/1/3/1/6/131606733/rimunati.pdf
    • http://files.yoyojake.com/uploads/1/3/2/6/132695732/aa0cdc.pdf
    • http://files.marinlivinghomes.com/uploads/1/3/1/8/131871871/folonakaketote-jegowa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8145/8069/files/kazekufuberekosoxuto.pdf
    • https://cdn.shopify.com/s/files/1/0428/4104/7206/files/7615180827.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/fanewoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/8035/1897/files/7065211092.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2066/files/jikufuwifikalek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/gagobaxiledes.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/tekuwurog.pdf
    • https://cdn.shopify.com/s/files/1/0435/8874/7423/files/61099173858.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5718/files/30660845285.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6087/files/38020784480.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nenixuraxolitater.pdf
    • https://cdn.shopify.com/s/files/1/0429/1067/9203/files/pemuse.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/1/0431/1705/206

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078dd.bin
0d77c76257e47bc78d08da148bd0b867da0c16e3bb8e6412c9c9108000399059		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DD 5728 bytes
font_01_sfnt_off00008c6f.bin
2bf8b9211e1e4fa6a3fbeec7060dbf5b1691d8c83d2b67f152a7eab22c37ea9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6F 10376 bytes

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