Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b548b67aef9691c…

MALICIOUS

PDF

43.8 KB Created: 2020-08-29 18:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 073da9820a8203524a9e1c26557191ba SHA-1: cf6d69a06e4b56983a5ba4fcf9cafad1857be63d SHA-256: 1b548b67aef9691cac3d99425d4428c64565f8ff0fc016704051f6cf3bd9990b
150 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, with one prominent link pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a 'coupon book template publisher' lure, which aligns with the malicious redirector's keyword. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which is likely used to funnel victims to further malicious content.

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/wix?keyword=coupon+book+template+publisher
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/gubevipenutekuxipozagixin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5680/7586/files/duvakalitaxujimaripadadek.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8889/files/53372019920.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1144/files/when_youre_good_to_mama_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/fawujarativuvuvum.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7191/files/7268517624.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/tratamento_candidiase_peniana.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/57721619081.pdf
    • https://cdn.shopify.com/s/files/1/0429/4901/7756/files/25307481919.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/98922087883.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/46357192842.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_off00006f6a.bin
51adf8c7bdd78546a514e14ebca5ac19a162908d4f9a4c9fc36afd7743084521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6A 5168 bytes
font_01_sfnt_off000080c6.bin
1f991798895fbbd7485ce788662af7a6347e9c0c482dd154e0e7d342e33c2446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C6 10052 bytes

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