Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7e0c2f80d9caf9…

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 10:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c758b6de27fb939f770e29849aaa9605 SHA-1: d69d542d61aa374b7fbeefdcdbcad725e53f5be1 SHA-256: ea7e0c2f80d9caf95c4982c0de7551b1eb864435d1f020fb1c90e5113b17a89a
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of the URL 'https://ttraff.ru/wix?keyword=agenda+docente+2019+pdf+gratis+chile' strongly indicate a phishing or redirection attempt. The 'PDF_SEO_LINK_FARM' heuristic suggests an effort to artificially boost the document's search engine ranking, likely to attract more victims. The ML classifier also flagged this PDF with high confidence.

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=agenda+docente+2019+pdf+gratis+chile
    • https://static.usrfiles.com/ugd/b8c837_ffcab909836f4f569240b4f477341320.pdf
    • https://static.usrfiles.com/ugd/b8c837_758a16ec0518498996994908b41602d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce6250a253c848d9bf17ad1eedaefbd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_413166dd6e904ee78e3076911b2f31fe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5211/3820/files/gopurafilutiforanaluwugad.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5224/files/93421080577.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cef71c938cc471db271b92371283acb.pdf
    • https://static.usrfiles.com/ugd/b8c837_163e8874deb34935ad4f2c67a3d5db7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d05f0c953a8b45b883990788c19958dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_8aef4bd7450e4bf58fb25e2af207edbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f4c05d4cd9f4809ad1a8fb468ce694b.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/vipimar.pdf
    • https://cdn.shopify.com/s/files/1/0440/4147/0117/files/41._8877_87._6361.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/tadoxedakupagasije.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b44.bin
ade3551498bef45cdafa4374062fa01c37af429ca52901cc94e7f0a9a0e9ee28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B44 5888 bytes
font_01_sfnt_off00006f42.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F42 1800 bytes
font_02_sfnt_off000077d0.bin
af44a6c90942ac8f655058d76145b3d7b628665cfed9a1e17e62432683b557ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D0 10712 bytes

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