Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ec2c8e1e9f1387…

MALICIOUS

PDF

43.9 KB Created: 2020-08-29 19:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6a3482b5794babbc3b16a435b5c2f0f SHA-1: 1d879a0ff5ddf5b4d097cb0ff66b6d0a5efa7ba7 SHA-256: 54ec2c8e1e9f13878250272463afb2cd0740e8042a5c560bc23946bdc36a1af6
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the same suspicious URL. This indicates a likely attempt to lure users to malicious sites through a link farm.

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/wix?keyword=appium+tutorial+for+beginners+android+studio
    • https://cdn.shopif
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/fukushima_daiichi_accident_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/bulabozupopaxesanib.pdf
    • https://cdn.shopify.com/s/files/1/0440/0952/1317/files/99568933861.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/87417410330.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9424/files/80348022890.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/43872177277.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/15017209429.pdf
    • https://cdn.shopify.com/s/files/1/0435/0718/7872/files/5761010256.pdf
    • https://static.usrfiles.com/ugd/b8c837_d238e8a2d67e4e41911288f40a2d4cc3.pdf
    • https://static.usrfiles.com/ugd/b8c837_64705baa84e54f04aaef17b344e24764.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dbb8c5f67c64c6e89d56df9f1fa27d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae7da68bce8846499a4a1e36268d7291.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_off00006d3a.bin
127b40b6f60d3cfc317952ca469ff81a101f8bd64fcc0f97cdc173834e0b88b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3A 5492 bytes
font_01_sfnt_off00007fc1.bin
be356f8c81f4208ecf00304e89ac33c2ae46dca4a2dd70e2721b05b9516a2f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC1 10192 bytes

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