Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cb90b3251024e4…

MALICIOUS

PDF

62.4 KB Created: 2020-10-30 17:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e5a68f6c16a0d35c2a8d48b3c33e462e SHA-1: eb71b522ecf63049b009d7cae9557ef699015cd8 SHA-256: 17cb90b3251024e48c6ab63369ee8f7104ee9fa270d1bfa149820dded9414f21
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, with a high ML classifier score. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. The presence of a 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document may also attempt to trick the user into executing commands, potentially to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=city+of+heroes+mastermind+macros In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5f96a67e90923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_5f8d2e5739937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zikeko/tinkle_comics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1810a8e-e3ff-45e5-a84e-9d7e76faccaf/kotepurusam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aeb2fc2-fc00-422c-878c-2127cf62840b/16348051037.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/fudezevuguwudodugadilur.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/gace_art_education_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9020/6119/files/kadelesovesogunimopeb.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/casio_protrek_manual_3415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff52a6c-0f09-47b9-9301-ee11fb02f6ed/milekov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5bf7642-d7d4-4ee0-98b9-eab61efe84dd/xeragaxoziwazo.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/93028178193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7143/9001/files/lafidapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4454/7991/files/reciprocal_of_4_11.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_off0000b426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB426 5236 bytes
SHA-256: 59424d9bfc6ada1e273dfbed309f4b442ed7feafbb70c19bae00eadd85d8d548
font_01_sfnt_off0000c5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CF 11676 bytes
SHA-256: db78b344e2b4e99e56a02cd608e4d569046a7c4b73826a7ad80edb1f91f09aab

Open this report in the interactive analyzer, or submit your own file for analysis.