Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f029cd8410bdedb…

MALICIOUS

PDF

45.8 KB Created: 2020-07-24 11:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af990997136c06e1a1aa04f2dfd42a02 SHA-1: 82aa5e2da3ac22ac2488fcf0adec9c27cf9de025 SHA-256: 1f029cd8410bdedbe11f452404f6fc633ff97a38362e235e23f6121105aba965
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of numerous links suggests a lure for SEO spam or phishing. The primary attack pattern involves directing users to external, potentially harmful, websites.

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=bootstrap+table+example
    • http://files.allcustomiron.com/uploads/1/3/0/7/130738912/zaxukovazewivuri.pdf
    • http://files.nashvillebaptist.org/uploads/1/3/1/3/131380547/baxumonorirup.pdf
    • http://files.treehouse-creative.com/uploads/1/3/0/8/130814596/3088513.pdf
    • https://cdn.shopify.com/s/files/1/0428/3174/1095/files/86590757556.pdf
    • https://cdn.shopify.com/s/files/1/0436/0955/5107/files/91612134389.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/42078867341.pdf
    • https://cdn.shopify.com/s/files/1/0430/4306/1913/files/fuwumimebakosubedoxako.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1238/files/89818503728.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/13946196244.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1142/files/nuvaxazamogapumu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/laxemelekuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4037/files/18390000519.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/53556323936.pdf
    • https://cdn.shopify.com/s/files/1/0432/4530/6011/files/duxenubo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7688/files/16287468389.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_off0000693a.bin
86ebf415f637cc4513403b573b2fc0c7dd2ea249546383f900a5a87a1410b110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x693A 4856 bytes
font_01_sfnt_off000079be.bin
c1e5eae2d8d959538dc0ce346e15e50d5df838dd279a12ea5827141dcc4fa586		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79BE 14776 bytes

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