Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb67b36ba26152b8…

MALICIOUS

PDF

48.4 KB Created: 2020-11-08 12:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5feed5726e2645ac4294111f8afb2c7d SHA-1: c01f7b74207b803377c3a36cd7a18ec94de1d2b4 SHA-256: eb67b36ba26152b85400fcf935d479b28337dbd1602e2de61269c793421b237a
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that redirect to known malicious infrastructure, specifically `https://ggtraff.ru/123?keyword=messenger+lite+latest+version+apk4fun`. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to download potentially malicious software. The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it's a link farm on disposable hosting.

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=messenger+lite+latest+version+apk4fun In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_5f99a9b950e1e.pdfIn PDF document text
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/lezifogu-vozomizaso-detelas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_5f8a13bcee6ca.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/sezexo_baboxixofe_dafuxorufow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_5f9cfa17161af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5fa23684a6d84.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/5622392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5f9bd89290d65.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/f084f.pdfIn PDF document text
    • https://sikisesuleze.weebly.com/uploads/1/3/4/4/134445421/9140029.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/4433998.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://joziwatokiwi.files.wordpress.com/2020/11/play_minecraft_online_unblocked_at_s.pdfIn PDF document text
    • https://dowuwiridewe.files.wordpress.com/2020/11/39385972362.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00006ffd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6FFD 11644 bytes
SHA-256: 05278bf8e3ecd9b8e364c0de098af3f90ebcf2b13192bc0eda587a37b53153bb
font_00_sfnt_off00005ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDB 5288 bytes
SHA-256: 7d443874aabf9b06fc9c8e2c337f44b402d83651cae67697132ffc0086b6f978
font_02_sfnt_off00009073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9073 10536 bytes
SHA-256: 65dace05c61de132369930b56a7b29b60cf5fa729ad06ab93227900b5ad488fb

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