Malicious PDF — malware analysis report

Static analysis result for SHA-256 f766a22427be8aa4…

MALICIOUS

PDF

40.8 KB Created: 2020-08-15 06:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5fd21971f49edc46fd3daf390727d1c SHA-1: e8b5ad1d10391a2c9709cd4d58ee99e77a1d25f2 SHA-256: f766a22427be8aa4fb162d6313725b9a6d786ff50fe49a1c0e542cf654110761
150 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic firing indicates that the document links to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=letter+d+worksheet. The document body, though heavily obfuscated, contains this URL and other links, suggesting a lure to external malicious content. No scripts were extracted from this sample.

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=letter+d+worksheet
    • http://files.fortbraggalleywayart.org/uploads/1/3/1/4/131453354/6317129.pdf
    • http://mitaditix.seniorvolunteersd.org/uploads/1/3/1/6/131607305/6433073.pdf
    • http://files.earth-protect.org/uploads/1/3/1/0/131070866/lefoz.pdf
    • http://files.meta-future.org/uploads/1/3/0/7/130775017/vetumitimopoz.pdf
    • http://files.thejesusconversation.org/uploads/1/3/1/8/131856195/2ab05a68ff.pdf
    • https://cdn.shopify.com/s/files/1/0431/4071/0566/files/83233999433.pdf
    • https://cdn.shopify.com/s/files/1/0434/4093/0968/files/65717603272.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8309/files/zetenemexizepumafejotix.pdf
    • https://cdn.shopify.com/s/files/1/0433/9168/0673/files/apathy_evaluation_scale_informant.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/jelos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8037/files/betigimebozomakalojusafoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9340/1501/files/zujefa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3421/4561/files/vumozug.pdf
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/vifatobevefo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/76722332257.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0808/files/25996479625.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_off000062a2.bin
359a34b68c5f56780bfb13628b0fba0fc16418e87082d9b136a044a33fba0c51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A2 4768 bytes
font_01_sfnt_off000072ea.bin
3ead2f775c43ffbe051b8b3ded0c022c3ea505581b1228a722e8511b4c4a1607		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EA 10412 bytes

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