Malicious PDF — malware analysis report

Static analysis result for SHA-256 759938fcd813db5c…

MALICIOUS

PDF

45.5 KB Created: 2020-11-03 20:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 54817e818114a46d8b1d259dea6c4c4e SHA-1: bca1b61d2c56458f2b49f7e7764a0cea7d678e52 SHA-256: 759938fcd813db5c3c0e40dcbbdb7b0819dd241a368bc5818d354ff136a49f32
94 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier as malicious. It contains embedded links, one of which points to known malicious redirector infrastructure. The document body itself appears to be obfuscated or corrupted, but the presence of these links suggests an attempt to lure the user to a compromised site. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=figure+ground+worksheets+free In PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/2914057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5f901108cf462.pdfIn PDF document text
    • https://netaxodesu.weebly.com/uploads/1/3/4/3/134367037/704939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5f9c287e5441b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394068/normal_5f978e5518e4c.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/mejawiwomak/wogesarofuxabedalofob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d53a34-ce45-445d-9468-75ed08f3e86b/kejepurivir.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/22918037614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c1e1dc-e624-4e05-8f64-5983a4c4e27b/gewapenixusinib.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/48677607317.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/chinese_fast_food_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/67104252707.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_off000072cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72CF 5040 bytes
SHA-256: e4a676abc44fed07ffb93834f6e7fac480218951f07b700c8c844b59446cdf4f
font_01_sfnt_off0000840f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x840F 11052 bytes
SHA-256: ad93d90ce59fe12ea4cdfb0a7505a05041c667bcae7d45dac2f93d6101b280ce

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