Malicious PDF — malware analysis report

Static analysis result for SHA-256 9500bd103c03d294…

MALICIOUS

PDF

38.2 KB Created: 2020-10-29 02:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c0b1fd891393d4ee7842bdef06c55469 SHA-1: b92ea407a371c8d01e83e11e7db244b3a0c8c3fc SHA-256: 9500bd103c03d29443fda2d45b5ed20840f00ce017733d7a0570031123c6e3d0
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to a URL designed to trick users into downloading content. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate a malformed exploit stream and a link farm on disposable hosting. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading "Melanie Martinez K-12" content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/aws?keyword=melanie+martinez+k-12+download+mega In PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/46e6b5fa21aceb.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/zebobulubeki_repozeli_lupokugezo_jixodezuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_5f915a920ebb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5f8a279178440.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/7611582.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/360e6.pdfIn PDF document text
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/9827162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f8c69ccdf794.pdfIn PDF document text
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/3827340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_5f92af246ef8f.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/jiwisigetizoxif/robavamida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6ecc8f-e64b-45e7-bd08-ebe0d1f52494/bosch_exxcel_8_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8898/4222/files/93494514169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cda15e-7b8e-43d0-9189-0ca2063ddd96/povevojiwakanarola.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/critical_analysis_tungkol_sa_migrasyon.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/4_pics_1_song_answers_level_6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9198/3013/files/mebumox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7365/2886/files/37195011362.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56BC 5396 bytes
SHA-256: 8b172f2f4ab884093ff6debf5e739b7e867fdba42d1e3cdeaa4c13a7d391d83e
font_01_sfnt_off00006931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6931 9960 bytes
SHA-256: 1592a390da9c7f5b4322a3e49d8368b2ae9abb51ab530a58053aa6ed2c4b03bf

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