Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4381a187b087b7b…

MALICIOUS

PDF

44.6 KB Created: 2020-11-02 15:25:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c789eaa2af5d66a55082bd1b70c7abb3 SHA-1: 31cc9267ef84bbceaa0ee132ee3f0e96b0d066c2 SHA-256: d4381a187b087b7bcadead7ee9e88558eb41aef57277770ac315095e2c473a7a
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically designed to lure users into downloading software. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains keywords related to game hacks and URLs, reinforcing the phishing attempt. The presence of multiple links to disposable hosting further supports the malicious intent.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.com/123?keyword=block+city+wars+hack+apk+download In PDF document text
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/kowetatesafibaxaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f8b5697be88f.pdfIn PDF document text
    • https://visuzajekug.weebly.com/uploads/1/3/4/3/134305902/jokopasosazuzigulero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f9d0fcd44161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f9f35897a215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f931ef857066.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/4559913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5f8dde096d886.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/9390274.pdfIn PDF document text
    • https://topejaliwas.weebly.com/uploads/1/3/4/3/134305960/tugove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_5f9d1e16413d1.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/1/0502/0647/4420/files/taxepasosud.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/chordata_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/1151/2986/files/osrs_big_chompy_bird_hunting_guide.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_off000066d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D2 5468 bytes
SHA-256: 35b824cc950c6e08e08e1b924b150acc2b34032edbd39ef492f18088726f96a5
font_01_sfnt_off00007981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7981 13904 bytes
SHA-256: 5d208caac89b2ad9c8926922f74da717c47054dd9be673d0ad6c0bb882c48b33

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