Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55200d816375f1a…

MALICIOUS

PDF

74.9 KB Created: 2021-01-09 23:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 03a9fabdd354eb8f77867baa5e0dbf38 SHA-1: cdcf409a721644994f6847f98589ecd0a0249366 SHA-256: e55200d816375f1afb727e0755dac58f88b98cd6294d0c027875ca10101df0d7
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/aws?utm_term=balloon+car+project+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f8bc91f409c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_5ff0be21c4e92.pdfIn PDF document text
    • https://tozusasulinun.weebly.com/uploads/1/3/4/8/134872335/zafanuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f8fa720eb1fc.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/iafifih/fun_sea_race_3d_game_download_for_pc.pdfIn PDF document text
    • https://site-1228360.mozfiles.com/files/1228360/mini_pizza_bites_snack.pdfIn PDF document text
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/legavelizisogowasos.pdfIn PDF document text
    • https://site-1178547.mozfiles.com/files/1178547/74843498074.pdfIn PDF document text
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/kedigalafoduve-galikevabeva.pdfIn PDF document text
    • https://site-1177153.mozfiles.com/files/1177153/huey_dewey_and_louie_costumes_through_the_years.pdfIn PDF document text
    • https://site-1172455.mozfiles.com/files/1172455/mi_10_launcher_pro_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_5fbb308d66c00.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 5040 bytes
SHA-256: 1e8a717bb7a2d6c865a604f0da499586b4501b332dec1886fd8932a5213ca9a0
font_01_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 10448 bytes
SHA-256: cd8fe79a2573d830ae6d5fcba6e9173989db56536f0f41a3abf555bbf1124f4c
font_02_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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