Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d66c64ac917b43…

MALICIOUS

PDF

44.7 KB Created: 2020-10-30 11:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cd7c7855932c3d88d22d305985de8192 SHA-1: 0de350b0b1cf263c75a990a934f8710a0ddc0304 SHA-256: 34d66c64ac917b430e16b3fd635df56ab82b456e5ede8b6738c184a538e3532b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

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://gettraff.ru/pify?keyword=csr+2+guide In PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/muganazaju_datezasasexipap.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/gasipakeger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_5f98886a7ce7e.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/2697538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f9797d014f72.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/mokivo.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/7b425b7.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/1/0433/3358/2998/files/ganiwuwisumap.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/bengali_alphabet_writing_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/16124700058.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5789/6341/files/android_factory_reset_button_greyed_out.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/statistics_formulas_mean_median_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/gebekapiratizijunef.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/xobakujidalukadogavef.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_off000066f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F9 4788 bytes
SHA-256: 71d06beeeafa928d332566a93ab0396d106db4fef930c420df1547fb1e18565c
font_01_sfnt_off00007749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7749 2052 bytes
SHA-256: 45161600c168cb86abea0d582939cff7e26865ccef696145a84b56b2745b4fe2
font_02_sfnt_off00007ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFE 11056 bytes
SHA-256: e212a119074fc06bfb6bb367ee3eb039d2d6f0546a68f520bfefe126b0a544fc

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