Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15a84e5a79c079f…

MALICIOUS

PDF

40.0 KB Created: 2020-11-02 21:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 452bad6b949bfa887c655e377b0fa2fd SHA-1: bf4e7a4246a542f8e955255012b1f1ee5b5a0527 SHA-256: b15a84e5a79c079f26b5350f1a66f1679f0168558f0315eccc57ac6cbb3a088e
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ggtraff.ru/strik?keyword=pokemon+moon+strategy+guide+pdf', suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=pokemon+moon+strategy+guide+pdf In PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/vevumisomus-ditukuwazapom-joveba-begibenura.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/8f10735b0e9c9.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/70fdf8.pdfIn PDF document text
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/4110868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5f979ecfae78d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5f99867f18a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f89c65c9cbf7.pdfIn PDF document text
    • https://wegotutitupal.weebly.com/uploads/1/3/1/4/131453182/laberures-zuzewekuselobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f89590bbad6f.pdfIn PDF document text
    • https://wuxotiwor.weebly.com/uploads/1/3/4/3/134335057/5788313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f8ec0665b652.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/fajeloninesitel/blistex_lip_balm_medex.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/percy_jackson_prophecy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/8074/0771/files/wesunize.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/all_colors_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/3557/9335/files/6463499004.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/administering_medication.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_off00005d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7C 5496 bytes
SHA-256: ffcef26811c47c121c2146a8da269fecfa63d2862b6e7ab876efc67ffb0ab1ce
font_01_sfnt_off00007036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7036 10408 bytes
SHA-256: dc8fc6700fd3f4d574327e3df14ea391e049d2c4110a21c636c67128d747d829

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