Malicious PDF — malware analysis report

Static analysis result for SHA-256 7989170408ca5c9b…

MALICIOUS

PDF

56.1 KB Created: 2020-09-12 14:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3c401c2f64dd6dc35efe698567f59f44 SHA-1: 138f91a5b38cad9e96eaeea51907dafd5278255d SHA-256: 7989170408ca5c9b70cdd9a8aef8682acf70d22b9f4fc2f054e8c598776402ae
242 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.club/pify?keyword=arrl+handbook+2015+pdf+free In PDF document text
    • http://metunig.emmanuelcrespoartworks.com/uploads/1/3/1/4/131409546/cba6a43.pdfIn PDF document text
    • http://files.8utennisacademy.org/uploads/1/3/1/1/131163851/kubonekalalumamubi.pdfIn PDF document text
    • http://renifun.pabepabeofficial.com/uploads/1/3/1/1/131164250/b083ca66b.pdfIn PDF document text
    • http://files.maryhvance.com/uploads/1/3/1/6/131607010/ace8b1.pdfIn PDF document text
    • http://files.katherinefusco.com/uploads/1/3/1/4/131453267/xalim.pdfIn PDF document text
    • http://files.kellyindustrial.com/uploads/1/3/1/3/131384604/d08da88.pdfIn PDF document text
    • http://kogawezid.coreypaulfunctionalart.com/uploads/1/3/0/7/130739379/tixadozel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9618/5763/files/ancient_greek_philosophical_logic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/xafuzuxusazokesoruvido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5540/7519/files/11441590326.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2499/8819/files/cetoacidosis_diabetica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9456/4250/files/65979048668.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1817/3086/files/xewawun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4061/1226/files/94194361042.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000902b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x902B 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off00009a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A25 5592 bytes
SHA-256: b6d478e64691d96a9c9ba18010884adfe84e11e4aa56b9b43c72318997d0762f
font_02_sfnt_off0000ad26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD26 11032 bytes
SHA-256: 1cbdec2f64c5abfb71102536c27c6a67f5128bcb75736f502a187b2c1a2a441e