Malicious PDF — malware analysis report

Static analysis result for SHA-256 23001d7880d68a4f…

MALICIOUS

PDF

46.4 KB Created: 2020-10-11 18:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 59e6c0998a9e167b11e0c38808f93b7c SHA-1: dda27b79f71e6fad15e0ae43a5d482b762f64dca SHA-256: 23001d7880d68a4f7ce5d7652e83130cfc680442bd1a3c5ad3c95248702c28de
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external PDF files hosted on various domains, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches one of the identified malicious links, suggesting an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=trace+determinant+plane+grapher In PDF document text
    • http://files.acadiabugproject.com/uploads/1/3/2/7/132740965/d188d211.pdfIn PDF document text
    • http://files.fiawashburn.org/uploads/1/3/2/8/132815866/2128672.pdfIn PDF document text
    • http://zofuk.shorespices.com/uploads/1/3/2/3/132303028/8291961.pdfIn PDF document text
    • http://rarab.nphsdata.org/uploads/1/3/1/4/131406665/wozeda.pdfIn PDF document text
    • http://vupexuw.fmbxoriginate.co.uk/uploads/1/3/2/6/132695924/dixupugupupele-giredate.pdfIn PDF document text
    • http://jefivax.youngjoopark.net/uploads/1/3/1/4/131453109/7b20bc3d.pdfIn PDF document text
    • http://files.mesabimusicaltheatre.com/uploads/1/3/0/8/130813317/nidabunifaj.pdfIn PDF document text
    • http://fitadux.vickijettterry.com/uploads/1/3/0/7/130775321/4f5a5f77.pdfIn PDF document text
    • http://wenotu.predatorecology.com/uploads/1/3/0/9/130969060/1898114.pdfIn PDF document text
    • http://files.johnbrittonbuttrill.com/uploads/1/3/1/6/131636941/japuvenuxokel.pdfIn PDF document text
    • http://files.ipacszilvimakeup.com/uploads/1/3/0/7/130739690/8d8057466346.pdfIn PDF document text
    • http://fakal.gymetc4u.com/uploads/1/3/2/3/132303221/supar.pdfIn PDF document text
    • http://files.archipelagics.org/uploads/1/3/1/8/131856146/zuwisanubap_worabavo.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/03ee3088-4696-45f0-8fea-719417560e88/raxonetagizalajinolake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b907ce9-f5dc-4826-badc-99f7e0b7cf7b/tatava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75784f26-5431-40ce-98b0-3f96b02bd165/kutepafexajuxawapurufif.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_off00006eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAC 5256 bytes
SHA-256: 3f274bb7d7ff1c8634ad443f5fba0e52f539bbac48716f8c067cec98f7659353
font_01_sfnt_off0000805b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805B 14232 bytes
SHA-256: b5f45ddc63decf948282788382f5a975e2ac81eaf2bf531fb2a6d626a35bffc2

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