Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf62f8db1b391ec…

MALICIOUS

PDF

69.2 KB Created: 2021-02-24 06:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2aff1fc6dd696cb3b20bebc63357acb2 SHA-1: 2d8620e309d7f8c864b1131dcdebed23ec495b80 SHA-256: fdf62f8db1b391ec91e3e8130c711e9b90ef8061332e440cf4383a9a62866c4a
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body text, though heavily obfuscated, appears to be a lure related to a product manual. The presence of numerous links on disposable hosting further suggests a link farm or phishing attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=cateye+micro+wireless+cc-vt100w+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5fce6e4c827dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_601b32d29c06c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481516/normal_60026a66c6a0d.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/IibgdO3/98234163759.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458615/normal_5fce5d1fb84b2.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/4txOgjX/never_have_i_ever_netflix_paxton_and_devi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5ffba07bd26f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fd34d688e5b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_6029048bf3d87.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/hjekieq/jungle_monkey_run_2019_results.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd1eea3a4955.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://rarifefivafew.epizy.com/start_settings_activity_android.pdfIn PDF document text
    • http://letugupinuvanu.rf.gd/mizasofulejexunuw.pdfIn PDF document text
    • http://limizepafut.epizy.com/first_vs_second_conditional_worksheets.pdfIn PDF document text
    • http://ponawalivemake.epizy.com/fatenifovonogop.pdfIn PDF document text
    • http://tabojiterakan.rf.gd/zemonotizufugez.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_off0000c3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E6 5328 bytes
SHA-256: eba0c111aa92ae5428978217c0b915d724ba1b890cb4626863397c40a01269d1
font_01_sfnt_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 10692 bytes
SHA-256: a3fc8d3cfa76c2e863b9acb26a185fed432b18c66a49fec6db233d2eb54ab5a9
font_02_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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