Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c105722df50b7e…

MALICIOUS

PDF

37.8 KB Created: 2020-10-02 17:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bd566619aec70b2ad83d97ad3a0d270d SHA-1: ad2671fb20d21a3ed43ebaee5285eeab7da94863 SHA-256: c9c105722df50b7e8865a003513feb610dddd0ba8894547fff93a52b4b0bf01d
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result for a medical textbook, which redirects to known malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to a redirector. No scripts were extracted, but the embedded URLs and the heuristic firings suggest a phishing or redirection attempt.

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/strik?keyword=manual+de+pediatria+federico+gomez+p In PDF document text
    • https://site-1038440.mozfiles.com/files/1038440/23287527885.pdfIn PDF document text
    • https://site-1038946.mozfiles.com/files/1038946/rojupa.pdfIn PDF document text
    • https://site-1036627.mozfiles.com/files/1036627/xolopejekutub.pdfIn PDF document text
    • https://site-1038440.mozfiles.com/files/1038440/boxugaseloserobukudadupem.pdfIn PDF document text
    • https://site-1036745.mozfiles.com/files/1036745/pifexupunobuwonateru.pdfIn PDF document text
    • http://files.northwestindianaoutdoors.org/uploads/1/3/0/8/130873987/ce35f6.pdfIn PDF document text
    • http://files.socialpsychologyasasection.com/uploads/1/3/0/7/130738503/xunura.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/d7958151-a05e-4cfd-a60a-18c25d1dcb66/vinerej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/limiting_reactant_worksheet_1_answers_with_work.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/8851/9586/files/ralamat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2255/6058/files/unit_10_choosing_the_right_word_level_g.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3075/4966/files/costco_stuffed_peppers_cooking_instructions.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_off0000577b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x577B 5352 bytes
SHA-256: adb37e9f516014f132195a6e1d55613214c8efd0c0a0571cfba5864715e8c88a
font_01_sfnt_off000069b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69B2 9628 bytes
SHA-256: 0716354fa10db80aa216bdbbe67a2308d17223f6eaab3867160642f077f4efd8

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