Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4aa7936e2e4416…

MALICIOUS

PDF

41.6 KB Created: 2020-08-08 14:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0281389ad6a009abe5633f62b3db8aae SHA-1: 5d61a7a6aa285804f1354aa8b3a58211f0378b43 SHA-256: cf4aa7936e2e44169bb3956306b8f5a46527f2e7e769f0ddf5bf50a475c19f3f
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though heavily corrupted, contains the URL that triggered the malicious redirector heuristic. This suggests the PDF is designed to lure users to malicious infrastructure, likely for further exploitation or phishing. 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/wb?keyword=orgulho%20e%20preconceito%20hq%20pdf
    • http://sepen.impactingcolorado.com/uploads/1/3/1/3/131383544/4988659.pdf
    • http://files.aharonbezalel.com/uploads/1/3/1/4/131452821/sanidoxugojuz.pdf
    • http://files.looe-festival-of-the-sea.com/uploads/1/3/1/3/131381231/jakin.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/41272978102.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/53230918445.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/faxatakofemexilenewaxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4225/7561/files/axel_f_theme.pdf
    • https://cdn.shopify.com/s/files/1/0435/6908/6619/files/rosevuvonopefixosin.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5382/files/11516054511.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/xoguwifijowegopoboxosudog.pdf
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/awk_programming_language_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6654/0711/files/wogimejobaveziladewugexug.pdf
    • https://cdn.shopify.com/s/files/1/0430/4814/0949/files/mutiwuvumanenen.pdf
    • https://cdn.shopify.com/s/files/1/0437/4167/5685/files/49796887338.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_off000061cf.bin
6715ebadd29b437250976d8d14448a1d9a5b023e6b89821b0fdf33445d0c448c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CF 5180 bytes
font_01_sfnt_off00007367.bin
696149e983cc346cf34bbc268936997602d611d3278b7e9aa35e31779de929cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7367 11372 bytes

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