Malicious PDF — malware analysis report

Static analysis result for SHA-256 552d0e5080030501…

MALICIOUS

PDF

35.3 KB Created: 2020-11-01 11:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ed5e0f7b9c618382f99b7b96187e17de SHA-1: 9c2c4777d832762133328c0fd68c88c2d58958bb SHA-256: 552d0e5080030501ce46a64513b44a74dc68e84281badafffb1c58a2344ebaac
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://gettraff.ru/123?keyword=slitherio+mod+apk In PDF document text
    • https://rutobugexamaxip.weebly.com/uploads/1/3/4/5/134508198/1494da317dcfd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f9a3f2192008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f9e5e7033baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f93cd41d73c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5f9828ed3aa4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_5f9e6a19c1657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_5f9b576bdeede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_5f9d923edfe42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_5f9d5e9f1dc00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5f8cae6fbc5b7.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/1/0431/0233/9232/files/13631878298.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/politics_of_space.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_off00004c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C17 5188 bytes
SHA-256: 508c4dee0e0ff5b53833f802ae8b66648b1b04a8feb9997c21602ec50f9cc182
font_01_sfnt_off00005d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D88 10352 bytes
SHA-256: d383e6a183c7c93525cd2523f5f4149be75fef9b23632e5bed364514ad3cf387

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