Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b2da5488e94075…

MALICIOUS

PDF

47.2 KB Created: 2020-11-03 17:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f58e8e746a59bd5e5f4cd881ece6ba2c SHA-1: 98407aea31c68f72238f9e8ac8a72efb54adde88 SHA-256: 93b2da5488e940757d74f68ce67d40bef2f0a0227ac877239b00793ee656bdd5
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that are designed to redirect users to malicious websites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for a "Texas Medicaid provider manual". The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

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 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.
  • 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/strik?keyword=texas+medicaid+provider+manual+2018
    • https://cdn-cms.f-static.net/uploads/4454429/normal_5fa0df122b430.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voxulija/76305365355.pdf
    • https://uploads.strikinglycdn.com/files/574b50d3-c906-4a3d-92de-8c9026a35c57/rogufazivekuxo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/cricket_iphone_xr_red.pdf
    • https://s3.amazonaws.com/punurum/39704846292.pdf
    • https://uploads.strikinglycdn.com/files/4a7731e9-c317-4f82-8436-f3fe035caff9/lesson_12.1_trigonometric_ratios_answer_key.pdf
    • https://s3.amazonaws.com/vabedafozo/lg_dual_inverter_troubleshooting.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/ashford_university_english_proficiency_exam_answers.pdf
    • https://s3.amazonaws.com/vexeliku/2d_array_in_c_programming_examples.pdf
    • https://s3.amazonaws.com/nonipesikiri/new_super_mario_bros_3_apk_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0501/7291/9963/files/pazozusawem.pdf
    • https://s3.amazonaws.com/susopuzupure/99445221757.pdf
    • https://s3.amazonaws.com/kufazete/zunivefonudivemirusixali.pdf
    • https://s3.amazonaws.com/jenagubadopi/watch_frozen_free.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/head_soccer_champion_league_2019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074e1.bin
38b4cd07534bc24137eaf6500fa52831187f5cf1519d30fb8cf67540b9c5904c
pdf-font-stream PDF embedded font (sfnt) at offset 0x74E1 5816 bytes
font_01_sfnt_off000088a3.bin
fbd601e0c1aee31175652cb03bc6085ff30b61f2287fe42a243bfd66c4240e4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x88A3 11516 bytes