Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2399419b27357c…

MALICIOUS

PDF

42.4 KB Created: 2020-08-21 10:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5261da093060c73f3930a372474a1892 SHA-1: 948f71b2bffce01e548e5100b3012639a0966e9b SHA-256: 5f2399419b27357ca965a1ea0fd40f8a63d5cc2fa2c39a28b037a24a513e0542
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and other embedded URLs. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing something, which aligns with the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/pify?keyword=ubuntu+18.+04+32+bit+free
    • http://pidij.keywestresortcasino.com/uploads/1/3/0/8/130813780/mijetel.pdf
    • http://mirulima.commerceelementarypta.com/uploads/1/3/0/8/130814411/zajinusek-bapez-dadifisegazoras-wukatikux.pdf
    • http://dututu.canera.org/uploads/1/3/0/8/130874422/9082763.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/burovekaxemobizuzovexew.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3258/files/19292289907.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/9941968634.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9309/files/koduborexinewuzemu.pdf
    • https://cdn.shopify.com/s/files/1/0439/9605/3662/files/25130297293.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/c_est_la_vie_bewitched.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/55303533040.pdf
    • https://cdn.shopify.com/s/files/1/0429/3256/8220/files/root_5._1_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/xuwuvimexeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3800/files/automation_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0443/3071/3244/files/nts_analytical_reasoning_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0569/7438/files/n64_emulator_free_apk.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_off000067e5.bin
90f1d0eae2fa95fa615c0c3369729e3b4795e3daa8119b74d604c77b4f92250b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E5 5276 bytes
font_01_sfnt_off000079fb.bin
325efc2d9be293ed02f4c16b644fb57bb6461c3006d1a11c0c5bcf695b58f436		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FB 10112 bytes

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