Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6a56752cba26cf…

MALICIOUS

PDF

69.9 KB Created: 2021-01-02 12:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3aaaf95e2e9bc74df5bde1267de8d772 SHA-1: e33927fc2d8ef6421a5112eca8ab55f0057f25e7 SHA-256: aa6a56752cba26cf9f0980f458990e886ed65a42835fa7acead38cd2bc2bc670
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting a 'free game' lure. The presence of numerous external PDF links further supports a link farm or redirection attack pattern. No scripts were extracted, but the PDF structure and malicious links suggest an attempt to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffmen.ru/aws?utm_term=free+game++karne+ke+liye In PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/suwagu-fejaxux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5fbaaf3e8accc.pdfIn PDF document text
    • https://toviwapomini.weebly.com/uploads/1/3/4/7/134727984/ronat-fivid-xodopelegado.pdfIn PDF document text
    • https://pepulerizalumel.weebly.com/uploads/1/3/2/7/132740212/2798025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5fe714252324e.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/rizok.pdfIn PDF document text
    • https://barigager.weebly.com/uploads/1/3/1/3/131398159/2d50250cd9a6a93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1b9aff-10d6-4cef-9cec-c1d3830d2318/33725337477.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/man_from_the_south_plot.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/arteria_uterina_anatomia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73833b82-9b16-4711-bcb8-ceb6e0ca6e6c/concertmate_990_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/declaration_of_renunciation_of_indian_citizenship_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/26602707022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7264764a-e308-403a-ba13-41777bb18605/geometry_little_jumping.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_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 4948 bytes
SHA-256: cd8d75ba8ce28a4cb9a5efc3d1508bd5a34dfcb943fc651c1d2951593fa3fa36
font_01_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 10212 bytes
SHA-256: ac65ddb146749a81bce6c438bdc09481f26232b02e41d3c5a5f49249f89a0767

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