Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5a03f968ac75a6…

MALICIOUS

PDF

38.8 KB Created: 2020-10-10 14:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 32c07e82a427b52d6d96555ada48e1d5 SHA-1: 5de7a4f1c0426edb2ffec8d0c88f4c5876687fcc SHA-256: cc5a03f968ac75a643e3f280d1aa434a6061cd6d5524530b2d0815bb113fae4d
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to a link farm hosting additional PDFs. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the initial redirector URL is associated with malicious activity. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs likely serve as a lure to download further malicious content or phish for information.

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://ggtraff.ru/pify?keyword=sekiro+dried+serpent+viscera In PDF document text
    • http://files.theconcertspot.com/uploads/1/3/0/8/130873903/dexazunide.pdfIn PDF document text
    • http://rupubore.catsmeowvarietyshop.com/uploads/1/3/2/6/132680835/fivixumiliwisog.pdfIn PDF document text
    • http://files.sm-art.com.au/uploads/1/3/0/7/130738771/xilodugufinugo.pdfIn PDF document text
    • https://site-1042627.mozfiles.com/files/1042627/88513449829.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/dopezebona.pdfIn PDF document text
    • https://site-1037149.mozfiles.com/files/1037149/68441310085.pdfIn PDF document text
    • https://site-1043569.mozfiles.com/files/1043569/68925189255.pdfIn PDF document text
    • https://site-1038397.mozfiles.com/files/1038397/97620497307.pdfIn PDF document text
    • https://site-1036869.mozfiles.com/files/1036869/78000796199.pdfIn PDF document text
    • https://site-1043458.mozfiles.com/files/1043458/molul.pdfIn PDF document text
    • https://site-1038780.mozfiles.com/files/1038780/pujimifipapa.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/1/0433/9607/1589/files/25491266675.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_off00005aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABA 5264 bytes
SHA-256: 944ed2143bb937303f2c5d3c09e334fbe49570d9633b5399dbfd37da3784416c
font_01_sfnt_off00006cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB1 9984 bytes
SHA-256: 9a83dc1257068f99b66fc74708a998f07df0a427f4f6bf3b00a837eca7578cdc

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