Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5043430069049a…

MALICIOUS

PDF

49.4 KB Created: 2020-09-01 09:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a77c95d4b1304b57d6864272a7860def SHA-1: ae0181d7ebf8572810a028df89129afb13f052a2 SHA-256: ad5043430069049af50f0de1a9ccaaba419ec1b92934e4251a3b77e537f1c901
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Sterling background check form pdf' and the malicious URL itself, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=sterling+background+check+form+pdf
    • https://cdn.shopify.com/s/files/1/0429/0324/0871/files/90173221073.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/78168164033.pdf
    • https://cdn.shopify.com/s/files/1/0435/5430/8251/files/wubakulefujuwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6547/3184/files/macbeth_commentary.pdf
    • https://static.usrfiles.com/ugd/b48b60_dbc2529edbdf47588e2d62bfac411517.pdf
    • https://static.usrfiles.com/ugd/ec0c41_11ef61975dd74673b6eb4fe7ba7e40d6.pdf
    • https://cdn.shopify.com/s/files/1/0463/8179/3435/files/80477111109.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/84299919805.pdf
    • https://cdn.shopify.com/s/files/1/0437/7831/0306/files/50840909418.pdf
    • https://cdn.shopify.com/s/files/1/0428/9147/7148/files/63716358678.pdf
    • https://cdn.shopify.com/s/files/1/0434/1628/9442/files/nadazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/85947808151.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/kulojelixa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d54.bin
87a7ad51f24b79e3ed9640016d93aa624e6bc5e9eb4872570300527afb8318d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D54 5700 bytes
font_01_sfnt_off0000708f.bin
8d109a5c4fa102f31e479b0f937a5d28bc23c08be83ac3f49891a62d2fd79b0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708F 15972 bytes
font_02_sfnt_off0000a23c.bin
9d161d6e34f835aff196e226d852edde4d65b072a4902c32411b177d8c29261e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA23C 16076 bytes

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