Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2b87843d8d581f…

MALICIOUS

PDF

76.5 KB Created: 2020-10-28 00:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 98b82e11979d579fea4bfcf64267f3a4 SHA-1: 16b93fd9db9df9830f1fd960776ed8a6253459f9 SHA-256: 4c2b87843d8d581f74d55197f22654616e4f4a147026c8504318c7346598f71c
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical link identified as a malicious redirector. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure and embedded links point to a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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.
  • 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://cctraff.ru/strik?keyword=pokemon+pearl+action+replay+wild+pokemon+modifier In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f9898a98121a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f87f60927674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5f934441cb714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_5f8a9738a19d3.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/felor.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/4e1ad30194a.pdfIn PDF document text
    • https://puvebimu.weebly.com/uploads/1/3/4/3/134311544/vimokapafiniwugugem.pdfIn PDF document text
    • https://sububavujowiv.weebly.com/uploads/1/3/4/4/134460245/vakewe.pdfIn PDF document text
    • https://lumozilupive.weebly.com/uploads/1/3/4/3/134336046/5f78fbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_5f94744d5a448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5f9623b756af5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f8dcf490e268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_5f9898df20439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f8f8b61e99d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f8d85594b9fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_5f8c9e699e0d3.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
    • https://s3.amazonaws.com/kavitokolezub/juxaxapenavo.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/animals_and_their_babies_flashcards.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/jonilol.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/reproduccion_animal_biologia.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/jibajev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5978/1023/files/2020_subaru_outback_3.6_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/25862026143.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_off0000d2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BC 5168 bytes
SHA-256: 011245a1c021f698d0f645db46faee3b042be2774bfeee45557e257d8347353d
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 14712 bytes
SHA-256: 10019f8c468b65d76e3ec02bdaf8cd285c9201506fcc937424daa343520fb071
font_02_sfnt_off00011407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

Open this report in the interactive analyzer, or submit your own file for analysis.