Malicious PDF — malware analysis report

Static analysis result for SHA-256 359a4fb158b25235…

MALICIOUS

PDF

45.2 KB Created: 2020-11-03 04:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8f648ae2ab2218a65c5a6c057f11173c SHA-1: be8e738ce94c5c324807ec341f7a7f416f31ef08 SHA-256: 359a4fb158b252355761a422cec8a79cb518942aac387e60e7490f252789e7d0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.link/123?keyword=windows+7+portable+installation In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f9364a417e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5f9265cea6cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5f8c0257ba88f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f8e50fa0ec9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5f9d6f672fee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_5f926926ea423.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/1438067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8bb480bf312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a855f705-b332-4ff2-a198-b3f8901f29ae/31390501994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3eee0b4-2440-4d31-a769-c3b99f079a67/zorato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808ce401-ad0b-46ab-bb16-f75d6ba0ec39/jivunax.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_off0000720b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x720B 5276 bytes
SHA-256: daf2b5f09d38ab1ed4532797708a6c5d11fdad75d577c6a351e19fcd6a189a07
font_01_sfnt_off0000841d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841D 10616 bytes
SHA-256: 33c38b94c2e985505afa8a98355631abc4aa46e270b6bb759395bf6a57397acb

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