Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd408e9bd01fd75…

MALICIOUS

PDF

37.4 KB Created: 2020-11-05 03:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3cdc1c671d466ac0a5f5965de16edce1 SHA-1: 3307fe985d2d60a5f828cc339815c054a6433e1e SHA-256: 9dd408e9bd01fd751e538a6dfe6d3e62e31ccbd46f1f646ec8090f82e1cb351c
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least two identified as malicious redirectors or part of a link farm. The ML classifier strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent and potentially lead users to harmful content or phishing sites.

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.club/123?keyword=unblocked+td+games In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f8a523de5d20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f9a7b28eb7b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_5f98760e5027f.pdfIn PDF document text
    • https://vinazawodix.weebly.com/uploads/1/3/4/3/134352366/bowenusif.pdfIn PDF document text
    • https://zupudawuliwubil.weebly.com/uploads/1/3/4/2/134265939/tomur-vabito-putoru-munatumexuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5f8effb472102.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/43a2be6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403417/normal_5fa1ba70659aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f897c5113552.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/gupuso/3851518596.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/education_twitter_chat_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/81089556702.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/bapelurofarojulo.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/texikaxewux.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_off0000572a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x572A 5356 bytes
SHA-256: e9a58e844e0e1ab458a4b6681045d6b242affdb47ce35bf5ad6bf2581e412d5e
font_01_sfnt_off00006957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6957 9364 bytes
SHA-256: 618bf4faf5fa0e39989d1c7d86701b506748b9f1c020a4916c2470c90e886c91

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