Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bd2cec23f6ae73…

MALICIOUS

PDF

40.1 KB Created: 2020-11-03 04:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7864b527f3064c93ddff65b305452797 SHA-1: c8ae727d2fa82663dd74f37be780b6288288e73e SHA-256: d5bd2cec23f6ae736f5a47edfa5aa230cc5a9ff0fd48d148d447000daee4f9ec
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The ML classifier and heuristics strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector finding.

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 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.
  • 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://ttraff.cc/123?keyword=toys+for+formal+operational+stage In PDF document text
    • https://vizomitula.weebly.com/uploads/1/3/4/2/134266598/9274066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_5f9504c801c90.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/762417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5f8cb955ad3e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5f8d40c38fb3f.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/fowitedaduvim_juremidegaliraw_susadedaliwab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f8a93d971118.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/sky_email_not_syncing_on_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0191/0683/files/half_life_practice_problems_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e757822-7b56-4eb0-a76e-91500353562d/28995335363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28676684-dd9d-46de-a1da-229bec199d3c/persian_chat_room_bia2_chat.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_off00005fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBC 5272 bytes
SHA-256: 704e64dce4f1e91716b094b75f87910bb5d859b26694bea57881494dc65ee022
font_01_sfnt_off000071a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A2 10224 bytes
SHA-256: c84023abbee3cce1202c82edf33a9ff1bf0fa089e08355503463ac5664f64ed3

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