Malicious PDF — malware analysis report

Static analysis result for SHA-256 844ecb3c5a7ee9a1…

MALICIOUS

PDF

65.0 KB Created: 2020-11-01 09:13:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 68438c432f274052912a7aa5e8ac88db SHA-1: 32a043b67787d57accd001ac72185ae58b8a2ac5 SHA-256: 844ecb3c5a7ee9a121fc1b9d41274cb3c36e239f159108c334971e33c6f56048
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, specifically pointing to 'ttraff.club', which is flagged as malicious. The document also includes a visual download button and text suggesting a download lure for 'showbox apk download android'. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow designed to lead users to potentially harmful content.

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.
  • 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/123?keyword=showbox+apk+download+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_5f964fdd022fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_5f8e015c534d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_5f98df4e641d1.pdfIn PDF document text
    • https://xozavakude.weebly.com/uploads/1/3/4/5/134581018/xunokunafa-megarite-dewodunir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f87b9638546f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f9ba03049610.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/wivunonovef/kadol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e65a3c-9895-4645-a2bd-8d53190218f0/81208286577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c646c1-92e6-4144-b851-bb2fb03df514/87170398400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf73dce-29c2-4990-9cba-fe8993e04637/suvapasejaroliberexexuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c02c8a-15e6-4ab0-910c-ab8272ab39c9/patofulevesubojubewi.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_off0000c037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC037 5336 bytes
SHA-256: f2fbd537456fe39404a413fcab36d45f016a03b28a4f3d539d07f35842f831cd
font_01_sfnt_off0000d265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 10832 bytes
SHA-256: bdcf6b534893f01d296d60665ce565424aa0aa5905cf5d3ef2d30e0691fc24e2

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