Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a1c21fdbb10205…

MALICIOUS

PDF

41.1 KB Created: 2020-08-29 02:39:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3ea61db20801c68fbb79bd763523224 SHA-1: 5ab69f94fdb0beffae6d6466c45d18556612221b SHA-256: b5a1c21fdbb10205707d1d5b3db23f443ed8103b5dd7ff76f9c4516d7219b594
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/wix?keyword=eso+darkshade+caverns, which is flagged as a known malicious redirector. The document body appears to be heavily obfuscated or corrupted, but the presence of numerous links, including the malicious one, strongly suggests a phishing or redirection attack. The ML classifier also flagged this PDF with high confidence.

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=eso+darkshade+caverns
    • https://static.usrfiles.com/ugd/b8c837_1e244c619ba3435db45c11b591767a90.pdf
    • https://static.usrfiles.com/ugd/b8c837_66982b67d4c2464abc877d2469cd7e2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e93d75c96154d1f9f1bd31d147980fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_14d2ad49b4374aca9468dc11e86e9712.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d19acdc6c0d443094c25e9c23efd574.pdf
    • https://static.usrfiles.com/ugd/b8c837_14ff98af2433439eacffcc91ab3a4e19.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/zizawixixofazogadawopog.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/rezupokidejakonum.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/black_star_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/73807348254.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/tirizapefomabukiwexifilo.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdfc22dafde64875ada98deafc55b3ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_39031162c1a244c890e29b41318ea892.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_off00006428.bin
4750266ffb408d1c3ea7161ed6edb885c37160885d3582682b4124504cee0b8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6428 5076 bytes
font_01_sfnt_off00007570.bin
cb840ac3c2e0809ad3c14240a31a56db7f1e8fc65684e52987b51c19a9fb5f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7570 10128 bytes

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