Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3beb1579d47b82…

MALICIOUS

PDF

58.2 KB Created: 2020-08-08 02:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf87dbf8872dd6b76c9f8afb0f70c5d7 SHA-1: 801edbb8038bcaad884afd3d9ae2f9ef6e05d3f8 SHA-256: ec3beb1579d47b825bac120cc5def80ce6cbf2896b7a17db0d6a7f502e2c9665
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this is a link farm designed to redirect users to malicious infrastructure. The document body itself is largely obfuscated binary data, but the presence of the URL and the link farm heuristic strongly suggest a malicious intent to lure users to external sites.

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=metabolic+bone+disease+in+humans+pdf
    • http://files.soltextiles.com/uploads/1/3/0/8/130814858/e6001b68.pdf
    • http://files.bearbuttewater.org/uploads/1/3/0/9/130969801/judibobomapeso-jolopo-varilarapozazaz.pdf
    • http://zoxuf.ellenitesfayephotography.com/uploads/1/3/1/4/131454012/relenavif_demuzi_mukadavofukitez_dekabi.pdf
    • http://files.widehorizonsretreat.com/uploads/1/3/1/0/131070993/1810992.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5005/files/52270379303.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/banefedoregove.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1192/files/fexozisupujinivaliwibagej.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7578/files/rejefezibuzufuv.pdf
    • https://cdn.shopify.com/s/files/1/0440/0077/2246/files/75003933810.pdf
    • https://cdn.shopify.com/s/files/1/0432/4537/1549/files/simokijawowulezab.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/40055565502.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/73259007409.pdf
    • https://cdn.shopify.com/s/files/1/0433/1061/2644/files/kogosurar.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/62996744875.pdf
    • https://cdn.shopify.com/s/files/1/0446/9604/3674/files/accounting_ratios_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/tasesobajabojuzuwam.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_off0000a4eb.bin
7d0904d3e917661cabd4247b944be5a09b8c1990da303fbb654f712afc87be07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4EB 5444 bytes
font_01_sfnt_off0000b74f.bin
512e33162cc4696fe6482f1ed2e65bcaacbf16fa4c099307e86672804e33e16c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB74F 10604 bytes

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