Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1fe278658c19a5…

MALICIOUS

PDF

39.1 KB Created: 2020-08-31 10:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9f077a1581acc47b451cd16119ba170 SHA-1: 4d6f30c75048216a447b066d4fae053ad87365c9 SHA-256: cf1fe278658c19a5e6f6c4b436bc5b536133be9bc722066917ee205f51eb01dd
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector to a malicious domain, disguised as a nutrition guide. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing attempts.

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=steak+n+shake+nutrition+guide
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9459/files/99882177849.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/up_apartment_ownership_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/96241006414.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/79025318182.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29529942485.pdf
    • https://cdn.shopify.com/s/files/1/0433/6333/6350/files/gadegore.pdf
    • https://static.usrfiles.com/ugd/b65acf_b756e4c5e5d04cea913cca0d1fee5fee.pdf
    • https://static.usrfiles.com/ugd/83d902_9b0cf88190f8426bbaf3953f2ae6c3fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_9aa06bbc0fc2415db93f5d392d6eafc3.pdf
    • https://static.usrfiles.com/ugd/913720_ba5168fda6a3476287cea135a4c7c991.pdf
    • https://static.usrfiles.com/ugd/cf14a4_1bf5a1201e5445b68f5d0343d0427a1f.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/68815491665.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5676/files/vakafoxonuxelo.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_off00005b64.bin
dc80a623387328bf5edd4b4a52eb23ca5db1e5d1046e1158e9af713f68334746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B64 5220 bytes
font_01_sfnt_off00006d13.bin
79424235a29bde23e754041dae76bee6037307531730aa72c844bbbb3f9d9a82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D13 10200 bytes

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