Malicious PDF — malware analysis report

Static analysis result for SHA-256 724ec565810cf960…

MALICIOUS

PDF

64.8 KB Created: 2020-08-09 06:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42040b6bfda026b6196f671d897c9844 SHA-1: 33788ad7f4eeb0698d3cb89b63f96e31b5700f18 SHA-256: 724ec565810cf960dc9588eb97fb82201c7b0dfa75d1ad512216b7fef8a19dec
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file is identified as malicious due to its use of a link farm and a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains embedded URLs and suggests a lure for downloading content, potentially a browser extension or update. The presence of a password archive lure and a download button heuristic further supports the malicious intent of tricking the user into executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=selenium+webdriver+tutorial+java+pdf+free+download
    • http://menubuz.thedynamicbody.org/uploads/1/3/2/6/132696323/06d033f2e7b27a8.pdf
    • http://files.lgbtwalco.org/uploads/1/3/1/4/131406861/337489.pdf
    • http://walejupaz.serenescenesinc.com/uploads/1/3/0/8/130814328/felejimuxowofubuzag.pdf
    • http://ritezak.ptcwyoming.com/uploads/1/3/1/6/131606289/mugogazariru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/alkaline_foods.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/14783229280.pdf
    • https://cdn.shopify.com/s/files/1/0430/7612/4821/files/pdf_encyclopedia_of_modern_bodybuilding.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3539/files/wepemilemuvavaxilinexoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6940/6360/files/wastewater_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7653/files/kuzasikefog.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/79187512192.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0439/files/the_asch_effect_a_child_of_its_time.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/21411400226.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/bebegisajumasa.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_off0000bf32.bin
d28288d29dd3808934fd086f1f72f1e7dde27513a4a765ec72b16b9ac5c837be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF32 5480 bytes
font_01_sfnt_off0000d1d3.bin
9d3562aa90671e53b8db79645d13d07bf9f5bedb5af0dcf89bd9580a17569d68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 10440 bytes

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