Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84a374dd9cb01b6…

MALICIOUS

PDF

36.3 KB Created: 2020-08-31 19:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19e76104b0f32d8966ba089d7be3841e SHA-1: e088e08d7f5df56f88dc7e96f984c2a4910a5a9e SHA-256: d84a374dd9cb01b6ed18d0a4e0588e9c1a57999502a87107e68add757e69bf2c
152 Risk Score

Malware Insights

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

This PDF document was identified as malicious due to its extensive use of a link farm, with numerous embedded URLs pointing to external PDF files. One primary URL, https://ttraff.ru/wix?keyword=bekhayali+video+song++in+hd, is flagged as a known malicious redirector. The document's structure and the presence of these links suggest an attempt to lure users to malicious content, likely for SEO-based phishing or malware distribution. The ML classifier strongly supported this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.ru/wix?keyword=bekhayali+video+song++in+hd
    • https://static.usrfiles.com/ugd/b8c837_e268caaef2da41fcadac0c154334b4f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_97b76e1d1499429887e9f71ee4ea7e7e.pdf
    • https://static.usrfiles.com/ugd/739437_f59a756f4733430d8613fcd27cbf1982.pdf
    • https://static.usrfiles.com/ugd/576447_27f43b82c63345f9b66b77ae83dfae80.pdf
    • https://cdn.shopify.com/s/files/1/0428/1116/2790/files/vedakefanuvedifudejovo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9583/4280/files/27008733605.pdf
    • https://cdn.shopify.com/s/files/1/0432/0565/6736/files/aparato_reproductor_femenino_para_colorear_con_nombres.pdf
    • https://static.usrfiles.com/ugd/08fe48_4d903e4decdc48448d5bca1e4e700e79.pdf
    • https://static.usrfiles.com/ugd/b8c837_bec52d215bef415bab6634e77357ab05.pdf
    • https://static.usrfiles.com/ugd/f63f29_ddddef9928c647f48e025a083288ca29.pdf
    • https://static.usrfiles.com/ugd/cc14e4_4f4267e9cc474304aedfae925cd44d94.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_648250f8f04c418daeb57a32bc101694.pdf
    • https://static.usrfiles.com/ugd/8ab72e_46f1aeb8bb6b4735ba73a0da244ac5dc.pdf
    • https://static.usrfiles.com/ugd/3f80ec_47d3236ccbcf4368b15028576f20935e.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_off00004f20.bin
6dc1670a7f250eeddae87d1d8ca8b6b597f145c154f2932cba12faa49745b3a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F20 5264 bytes
font_01_sfnt_off00006119.bin
2287d4fc95ec712645afcb29859c772a865f1fef847472c5cac2ced451eb9b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6119 10936 bytes