Malicious PDF — malware analysis report

Static analysis result for SHA-256 896a9e67be9ef025…

MALICIOUS

PDF

44.4 KB Created: 2020-08-21 12:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f54610d1f9c93044d3dd237010d91f SHA-1: 8302c6d0413d75396f1c16e4cef44d1417da7885 SHA-256: 896a9e67be9ef025094005b462669b671c7eca56b3fb7e750d51ae89eab820eb
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure to update Adobe Flash Player or Chrome, directing users to a malicious redirector URL. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm used for SEO poisoning or distributing further malicious content. No scripts were extracted, but the overall pattern points to a social engineering attack to trick users into downloading potentially malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • 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
  • 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/pify?keyword=adobe+flash+player+chrome+update
    • http://files.ifbiblechapel.org/uploads/1/3/0/8/130873787/64c0b48d932c.pdf
    • http://files.maisyandlolarentals.com/uploads/1/3/1/3/131380600/mibabubelugi.pdf
    • http://wilame.finewineandesotericspirits.com/uploads/1/3/1/3/131383483/godatoweno.pdf
    • http://wepugaf.texastyp.org/uploads/1/3/1/4/131410007/jezawaboguguf-kamiwefab-xuwadu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/rikenurub.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7049/files/8400802099.pdf
    • https://cdn.shopify.com/s/files/1/0430/7186/4993/files/38362436228.pdf
    • https://cdn.shopify.com/s/files/1/0440/1856/5278/files/el_poder_de_la_kabbalah_libro_completo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7493/files/fiforanovoledupajixaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/seamless_black_steel_pipe_schedule_40.pdf
    • https://cdn.shopify.com/s/files/1/0431/2249/1553/files/43572515451.pdf
    • https://cdn.shopify.com/s/files/1/0443/8881/0918/files/ana_catalina_emmerick_libros_gratis.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_off00006ec7.bin
49d8d7382fd5fe7d9c2d24aca2dc429612f5cdfc48b596c0be95b7949036b356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC7 5628 bytes
font_01_sfnt_off000081c2.bin
c4c23e324dcdbfa7a1a414845c8a8e7c620607a8c74d87b7598d8befe2d52307		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C2 10228 bytes

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