Malicious PDF — malware analysis report

Static analysis result for SHA-256 8312aeadec825cf5…

MALICIOUS

PDF

165.0 KB Created: 2020-11-03 14:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a715f60b8b8821e53aea0f6e341fd2ef SHA-1: e907ae863023b840696ebf463020c7add8b0966e SHA-256: 8312aeadec825cf52352d33092223feffffbc1a7c978fd33e266beebe36d2d4f
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 URLs, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains a URL that matches the IOC, suggesting the document's primary purpose is to redirect users to malicious infrastructure.

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.cc/123?keyword=japan+s+climate+type In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f8a2161a1796.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/10610.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/givutorodebekunav.pdfIn PDF document text
    • https://jidugurulepapol.weebly.com/uploads/1/3/4/3/134310086/rirewi.pdfIn PDF document text
    • https://kenolafopufa.weebly.com/uploads/1/3/4/5/134528829/8b9f58482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f9d31326229b.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/d5583.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/d1ee3c84.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/vabemavuputenif/73167390572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91a0687-5a67-4fd1-a6d5-dbc2c1ec6e61/65000683601.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/icao_annex_17_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd37c9d2-fc38-469e-a0bb-b3060a3f2fac/zuwolevafazuzude.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB5A 52580 bytes
SHA-256: eb64da9a6a8d57281a483260b3b29dce3736ad15e93b68b942e5d4369ec2b452
font_01_sfnt_off00024a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A5C 5072 bytes
SHA-256: d47665a61cba300e71dda0f8ea68709e9f190969a50ea351eff82dc47a1ef526
font_02_sfnt_off00025b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B9B 13776 bytes
SHA-256: e37795c093f942693c53eb92222fd528466015e40df733ca6b58f8068e0f4982

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