Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33fdc9c9567d784…

MALICIOUS

PDF

51.2 KB Created: 2020-07-29 18:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa12ca5fe2caf4eb52c7c04959a27ad5 SHA-1: 65b7e16dfcf92714f8ada20aca078e9e8bf46867 SHA-256: e33fdc9c9567d7846f577ddf393e265748099e9db3eef71dbdb96518b819eff7
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, suggesting an attempt to artificially inflate search engine rankings or distribute content through numerous links. The embedded URL and the document body, though heavily obfuscated, indicate a call-to-action to download content, aligning with the malicious redirector's purpose. The file was generated using wkhtmltopdf, which can be abused for creating malicious PDFs.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=a+shiver+of+light+pdf+download
    • http://files.kristinbruni.com/uploads/1/3/1/6/131606395/wevawujok-gapavefevumolo-noditimu-siwaseviwi.pdf
    • http://files.northernirelandteacher.com/uploads/1/3/0/8/130813757/b00f3d00.pdf
    • http://files.southtownscatholic.org/uploads/1/3/1/6/131636990/3996155.pdf
    • http://files.xtendinghands.org/uploads/1/3/0/8/130874110/pitetufozotelas-roxuniv.pdf
    • http://files.mlfickcourtlandkindergarten.com/uploads/1/3/1/3/131378950/gojukefitijijuj.pdf
    • http://files.northernirelandteacher.com/uplo
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/67686760974.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/ponopowofisew.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5229/files/14120959115.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/nogejadulofasivelabakekes.pdf
    • https://cdn.shopify.com/s/files/1/0438/9755/3064/files/soditonigiludugibuwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/rigosixixifanomofetiseb.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/28505422816.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/lokuberedukuxij.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/lekixunarafewizitejatip.pdf
    • https://cdn.shopify.com/s/files/1/0435/5457/0399/files/73064187895.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_off00008af1.bin
3c9ee1198ace66bf3ffef6b8d95bbc14ce186cd39e151f37e2a2b7c55d5f9fca
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF1 5232 bytes
font_01_sfnt_off00009ccb.bin
603f3d752b651d960045e5b9cb88bdb383fd76f005b8a2ddf6a5aaa2564a6cda
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCB 10260 bytes