Malicious PDF — malware analysis report

Static analysis result for SHA-256 64071b5ef36857a9…

MALICIOUS

PDF

43.9 KB Created: 2020-10-20 01:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 218096f39c573acefcbf5eceeb6e0d0c SHA-1: f6cad1e58fc57698332dadf8302048c5eb051db0 SHA-256: 64071b5ef36857a909fa8791c6163977f65f91d8a4600fb48152dfe4d3680e8c
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.me/123?keyword=image+file+to+pdf+converter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f887ec69f945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f8a0931bfd8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f899b06c63a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f88d5442cd32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f8e08092ac1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5f8e04aee3de6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f8985a84fd4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f8ac32b63362.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/lanadez.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/wadumu.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/1/0437/7142/9025/files/zenobia_summoners_war.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0912/4763/files/noodle_street_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288740e6-339e-424d-bc7b-e5fd0313ea30/6895888943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401c40bd-06d4-4a95-b2d7-263f23858428/lojemidadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7201/0408/files/8263679445.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5916/2521/files/dish_tv_remote_app_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/6539/3319/files/1577424718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0728/1832/files/56409131816.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67B9 5296 bytes
SHA-256: 4b2dc084fd8d9501aa86123b55d73ab4d4e06419aabd0fa89d04fdf95c05bfba
font_01_sfnt_off000079aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79AA 13004 bytes
SHA-256: df3ce1a409c6128e6ec78641bb606bbd07c02e48862d9164fa5f14ebf7babc20