Malicious PDF — malware analysis report

Static analysis result for SHA-256 766ebddeea326561…

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 21:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ea67699102aa45e9ee7cea400af920a SHA-1: a02ba0be882e99f0a82c550e38d9deb822442fa5 SHA-256: 766ebddeea326561709963518341087c8d9143869b2a5497708f08b0858aa37b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the redirector. The presence of a remote-support tool lure heuristic suggests a potential pretext for further compromise. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=what+is+spatial+sound+windows+10
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4823/9257/files/brain_teaser_questions_without_answer.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/63680505291.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/77267869262.pdf
    • https://cdn.shopify.com/s/files/1/0428/8145/0151/files/jiwar.pdf
    • https://static.usrfiles.com/ugd/a467d2_0fda57dbdf0643fc81d0d6d2bb7ec8ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e124e27a9ad40eaa2c231729b4f7778.pdf
    • https://static.usrfiles.com/ugd/96768c_2ff8e5f24f5b4af3b4ab36d89fead804.pdf
    • https://static.usrfiles.com/ugd/b8c837_6eed2c5a91d44e8e9499a91278564030.pdf
    • https://static.usrfiles.com/ugd/b8c837_54b9d9deb186495c844334894d34d319.pdf
    • https://static.usrfiles.com/ugd/b8c837_56d54847a64f4655a2ec39c63baa34b4.pdf
    • https://static.usrfiles.com/ugd/868401_ec70c7a9e1c340e6a8c66f9065420a4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_085437aa8ead483f82bd694a5c504171.pdf
    • https://static.usrfiles.com/ugd/963627_5d1b9d158c70425f9068d9ad49ccc3d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_78933278833e4d14aec1e5388937cc2b.pdf
    • https://static.usrfiles.com/ugd/10e3af_e974d782e1294130825d49a2cd10b941.pdf
    • https://static.usrfiles.com/ugd/b8c837_f451dc816fca4411af055875a0af53e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e4350b43ae547118527007f65489b33.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061dd.bin
042ed625853f8d30249fb054075ab32aedadf65072d13815025fbfba6a48ecc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DD 5248 bytes
font_01_sfnt_off000073ce.bin
945fc9c814e87cd1df504dfda809a144eca93b2b976e0951a22adbb75212e0d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CE 10100 bytes

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