Malicious PDF — malware analysis report

Static analysis result for SHA-256 7521cead85214252…

MALICIOUS

PDF

45.6 KB Created: 2020-10-03 01:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6a8b784d346cb2a3619c3508dc2ff397 SHA-1: 799c433b775de95be7da803dff16182331fd2631 SHA-256: 7521cead852142521587f3d609a501eaedbe72d0e7aa21bb48632e1d9939d971
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches one of the identified IOCs, suggesting the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://cctraff.ru/strik?keyword=game+booster+2x+apk+mod In PDF document text
    • http://guput.themysticlivingschool.com/uploads/1/3/0/7/130738696/1384318.pdfIn PDF document text
    • http://files.michaeljaigrant.com/uploads/1/3/0/7/130739393/8428098.pdfIn PDF document text
    • http://fofalusux.tynesidebookclub.com/uploads/1/3/2/7/132740564/1207190.pdfIn PDF document text
    • http://rawime.sheepprogram.com/uploads/1/3/0/7/130776334/1322385.pdfIn PDF document text
    • http://files.writtenbyapro.com/uploads/1/3/1/8/131857334/savox-videwejeve.pdfIn PDF document text
    • http://zumililuw.andrewpeterson.net/uploads/1/3/1/4/131483245/d85f6f1.pdfIn PDF document text
    • http://files.andrepoulinnyc.com/uploads/1/3/0/9/130969631/zitasaromesanidituki.pdfIn PDF document text
    • http://gojunijen.wingsofhopemankato.com/uploads/1/3/1/1/131163953/82ea2c9710909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2E 3384 bytes
SHA-256: 14d5399f077bfb828d17bb42b5a82ec924688c8fb2538366fdd1c1c415a43337
font_01_sfnt_off00006668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6668 5144 bytes
SHA-256: a9613c6a6738ee96c95a2842b5f81e3fc861746d6cd499ecc9c3b6190a4bc904
font_02_sfnt_off000077ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77EE 10328 bytes
SHA-256: cc3c5ca89b2ff63532792fd3a649470e92f0b3a8dd1efd17c690d9742e4bfa88
font_03_sfnt_off00009b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B45 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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