Malicious PDF — malware analysis report

Static analysis result for SHA-256 e961053f5c552306…

MALICIOUS

PDF

45.3 KB Created: 2020-08-19 13:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2a504c8f242e69202d813e1635f0908 SHA-1: aadffef24c0f1ea1a623fcd12efb527297b876c2 SHA-256: e961053f5c5523063478aad3997e57e3ebd347536ee4a085aebe74c909ccd7c8
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'sample leaving against medical advice form' and includes the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm for SEO poisoning or traffic redirection. The ML classifier also strongly flagged this PDF as malicious.

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=sample+leaving+against+medical+advice+form
    • http://files.neuro-flowgroup.com/uploads/1/3/0/7/130739116/8640678.pdf
    • http://files.garyandfrancesgreen.com/uploads/1/3/1/4/131406741/5116967.pdf
    • http://talopem.spicywatch.com/uploads/1/3/0/7/130775734/wotekojul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0048/7332/files/zapatoxemitad.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/17373670849.pdf
    • https://cdn.shopify.com/s/files/1/0430/9221/3911/files/luxikefowuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/koxinamegazitudulodorubox.pdf
    • https://cdn.shopify.com/s/files/1/0437/1084/1000/files/55194244207.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/bogogo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/amelie_piano_noten_kostenlos.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/koserozo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/beetle_drive.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/kudijogoroxor.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_off00007275.bin
93fbde09c76ed259052c05ecc3289edfd67fdf46314522e9ad8640407e765814		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7275 5636 bytes
font_01_sfnt_off0000858e.bin
763394f37df8178457cfd2ca581cc17db97120221ef5a358de77edf0d9cf58a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x858E 10204 bytes

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