Malicious PDF — malware analysis report

Static analysis result for SHA-256 23399d3d80ee52bd…

MALICIOUS

PDF

40.1 KB Created: 2020-11-08 16:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b00335c2150cab96ad19b024308a69e4 SHA-1: 7b1f55429e13b2e50ab858c8266ccaaeca10c059 SHA-256: 23399d3d80ee52bdf87b8d48803713d30770413d83f4e82c92065a8604b3977c
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?keyword=teddy+bear+picnic+5k In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_5fa0d4dcd3366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5f9b2a1b702da.pdfIn PDF document text
    • https://bezoduremudopez.weebly.com/uploads/1/3/1/4/131437412/sebal-julokutajetu-pubik-fepapat.pdfIn PDF document text
    • https://sagerogokijisoj.weebly.com/uploads/1/3/4/6/134601402/7659800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5f8dffede9e6e.pdfIn PDF document text
    • https://gumopukuzi.weebly.com/uploads/1/3/4/4/134481114/9664766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nunuzeru.files.wordpress.com/2020/11/28274419540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e669b9-d421-4046-b10d-b5363587a83b/37679726023.pdfIn PDF document text
    • https://metabufag.files.wordpress.com/2020/11/scorpion_king_2_full_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76159027-1321-4e1a-8593-17507cf7aaf0/87634729437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9271a685-577f-4309-ab47-232ea08d3102/vavomekosu.pdfIn PDF document text
    • https://rarokazuj.files.wordpress.com/2020/11/wogajegoxowabid.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_off00005b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B24 5236 bytes
SHA-256: 8042a47f5bb7145081a40a5941d91b98629a01b62b6ee7d809d62ecf72d8ae4c
font_01_sfnt_off00006d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0F 11564 bytes
SHA-256: bbaf45ac52eac4178afe845fd5682613f809cf628a11bea3f465ba28c00d85c8

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