Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da1079b283bd895…

MALICIOUS

PDF

40.5 KB Created: 2020-08-04 23:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ed62b5f10db30eb9f0e5989bdf141f5 SHA-1: 83b19af91b7286de06356c31aa1d0102958d75a6 SHA-256: 7da1079b283bd8952047c7ca414fb769d75abca78277a4eb3dc847f5a95a8672
194 Risk Score

Malware Insights

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

The PDF contains a lure for 'A level biology notes pdf download' and embeds multiple links, one of which points to known malicious redirector infrastructure. The document also employs a social engineering tactic to trick users into installing a browser extension or update, a common method for credential theft or malware installation. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or redirection strategy.

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=a+level+biology+notes+pdf+download
    • http://files.myslotweb.com/uploads/1/3/1/3/131398498/xupag-roduwogazesila-sepopi-fosarovutuvixi.pdf
    • http://files.usucbs.com/uploads/1/3/0/8/130873975/nifuzu.pdf
    • http://files.wastatefed.com/uploads/1/3/0/9/130968961/vojopa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/16706746565.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/10354743884.pdf
    • https://cdn.shopify.com/s/files/1/0431/9631/7845/files/23800479268.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3282/files/guzub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/83534417067.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1062/files/wujuvo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5495/6695/files/42751842497.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/just_play_bridge_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/0963/8553/files/4124239353.pdf
    • https://cdn.shopify.com/s/files/1/0436/3694/9152/files/ppap_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005384.bin
863963331bd505a24890f75860578139f81767d842153bb900d41c70fb20f20c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5384 5284 bytes
font_01_sfnt_off000065a8.bin
2e1f53cfc29fa60281dc9c50622813613dd2c0b98581875e2c7a35a8bc8c567b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A8 9748 bytes
font_02_sfnt_off00008715.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8715 4324 bytes

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