Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec93d36db2ccff1…

MALICIOUS

PDF

42.3 KB Created: 2020-10-30 22:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 556c4f1cc069eae9b41e3e191bbf5d33 SHA-1: e8255e7ad4e4790936b4e84bfff0a283f0f953cc SHA-256: 2ec93d36db2ccff169b31d4ec2a2b9e6c88bd9e41df821fc496f6387a1b1257b
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, suggesting a link farm designed 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://ggtraff.ru/123?keyword=poulan+pro+hedge+trimmer+manual In PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/limibexokosefe_gebisedalewekob_kibaragub_wotumigoxabu.pdfIn PDF document text
    • https://pitamiled.weebly.com/uploads/1/3/4/0/134098016/72926.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/5703321.pdfIn PDF document text
    • https://xasotuda.weebly.com/uploads/1/3/4/2/134235861/xotat_mojoxituzu_fudatatokarunez.pdfIn PDF document text
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/sutogiv.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/ravobewojuduk_mugefu_wizudirujitut.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/1/0439/1731/2152/files/el_arte_de_la_seduccion_audiolibro.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/64248989628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c9f1c0-8477-4909-9886-050f7467bc8c/54503276737.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/57292515525.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/damodar_aarti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6150/1848/files/latest_google_play_services_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a42597-b8b1-403e-a279-baf71bb2df2a/neopets_stamp_restock_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/rujufejoreraregujevina.pdfIn PDF document text
    • https://todayshomeowner.com/wp-content/uploads/radio/files/2019/04/20.mp3In 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_off00006607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6607 5196 bytes
SHA-256: 95991fc720d4de0246501899ec44b7ab958b02c9886bd2cb3e427acff7e0891c
font_01_sfnt_off0000778b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778B 10740 bytes
SHA-256: 43b4d00b3dbfa5576f0804afd039ad15217c9adc859ccc5c57d147cc7cc61637

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