Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41cd3b94a38e2e7…

MALICIOUS

PDF

47.2 KB Created: 2020-08-31 12:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f023d2ec7ac0dff5dd8e6d3ab9559c8d SHA-1: a241b81b1a69f51d55a18209fab5fba899864fdc SHA-256: d41cd3b94a38e2e724c7f76553274a9505f6841aea44134c173fe48eebb89950
130 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users into downloading software. The document body, though heavily obfuscated, contains text related to downloading software and includes the malicious URL. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing strongly indicates a malicious intent to redirect users to harmful content.

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.ru/wix?keyword=descargar+corel+draw+10+portable+gra
    • https://static.usrfiles.com/ugd/d9d1f5_e969674411f04da2add04db4939b7906.pdf
    • https://static.usrfiles.com/ugd/15cd4d_072b624ba8364ee0881eb52c2d9bb4cd.pdf
    • https://static.usrfiles.com/ugd/73cb9e_423bf2816e154fe5900c22de90b23dca.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/nvidia_960m_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3085/files/just_2_words_answers_276.pdf
    • https://cdn.shopify.com/s/files/1/0433/7441/1926/files/jewegexo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3100/2269/files/xubedipuruxexojirewepozi.pdf
    • https://static.usrfiles.com/ugd/b8c837_7492fa46f0884664b73071ecbe1ce725.pdf
    • https://static.usrfiles.com/ugd/a382ee_d2070101c6204702b4e9698bdffffc07.pdf
    • https://static.usrfiles.com/ugd/96bf9d_09c020ff340d474e8a79d5e57a55b143.pdf
    • https://static.usrfiles.com/ugd/0d2908_5beeef57bb1d44269578e030f30cc134.pdf
    • https://static.usrfiles.com/ugd/f63f29_d03ddd647aa346c9b5f76380a59e8d13.pdf
    • https://static.usrfiles.com/ugd/4d400c_3e6fa9aab7bc47148b9e512d1cb3919f.pdf
    • https://static.usrfiles.com/ugd/33a2e4_2478fe15966440b6a6be4e24a2cc3f48.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_off00007811.bin
c99f1385f4e98ff0ab6ca18ecde21cf40178d153d5cdb7b086cdc50e729de39c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7811 5668 bytes
font_01_sfnt_off00008b7b.bin
c9a59a168784ef490ef58504bc28b0ca9b1c0b50f9756c6619e72ca1c9953499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7B 10788 bytes

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