Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52f137212f26ae2…

MALICIOUS

PDF

52.8 KB Created: 2020-11-04 10:19:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 903fd5798d57f206b4e9041b367ca3a0 SHA-1: 3566277906822aed9bf757d84eb97c927c22eee6 SHA-256: a52f137212f26ae2741dc923edd0f3cf2de6f2eeea6afd093a334338141371ff
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on redirector domains and are part of a link farm designed to improve search engine rankings for malicious content. The primary redirector URL, 'https://ttraff.link/123?keyword=simple+rental+lease+agreement+free+printable', suggests a lure for users seeking legal documents, likely leading to a phishing site or malware download. The ML classifier also strongly indicated maliciousness.

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.
  • 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.
  • 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=simple+rental+lease+agreement+free+printable In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_5f9af60881722.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/jajix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5f9c1db6e9b87.pdfIn PDF document text
    • https://solusolifodijal.weebly.com/uploads/1/3/4/4/134433047/3637908.pdfIn PDF document text
    • https://bavobero.weebly.com/uploads/1/3/4/5/134585538/8872690.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/tonisefoteka/29502100430.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/tefelazejux.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/jofedidevoresapobo.pdfIn PDF document text
    • https://s3.amazonaws.com/wisatutadi/kolokegenajemiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/kemulekupejoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/nobizafisuwifuzupivo.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/basic_classroom_language.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_off00008eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ECA 5464 bytes
SHA-256: 8658e7af0942eedd108ce4ce2d89a383637f9f97fe2aed38fcec7a73817d3ed9
font_01_sfnt_off0000a13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA13F 10728 bytes
SHA-256: 159ef8d8ae2e5fb14dd833fe7ff69a11893c88eecbc53bd7be118300105af2ff

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