Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98cc2b4dca57821…

MALICIOUS

PDF

50.0 KB Created: 2020-09-30 15:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1b407466adca9ab6436905d3c4ef7d56 SHA-1: 75434ebc5d0b57dda9d5a46cf527b583fab647e8 SHA-256: c98cc2b4dca57821c68cea8fd208bfec8f805656e35c1c04a2c36d3833bf09c8
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with the primary one redirecting to a malicious URL identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, suggesting an attempt to distribute malicious content or engage in SEO abuse. The document body, though heavily obfuscated, contains a URL that matches the suspicious 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 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://cctraff.ru/strik?keyword=awards+and+honours+gk+pdf In PDF document text
    • http://files.adultlearningarch.com/uploads/1/3/2/6/132680907/fawoxos.pdfIn PDF document text
    • http://files.combatrevamped.com/uploads/1/3/0/8/130814355/lipafa.pdfIn PDF document text
    • http://files.aplacetorest.org/uploads/1/3/2/7/132740338/dujado_berok_walurotezes.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/7749c943-1b0d-4f8f-ae12-80adac20cf8d/xixaronukipafifadugita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba14c69-c5a3-4fd4-b83e-a69ff99b9d69/845312110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445a2270-6243-46d8-9f07-7e59a3f6a302/rixikoxuvit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00193b04-5fb7-40ea-b3b6-b6c08e25d894/70802967794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c9587b-fdaa-424b-858e-9debb2c7ba95/11023424579.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1921/3727/files/48855867804.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/83938374273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/4892/2270/files/half_centimeter_grid_paper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/neleximorowunekudaxu.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_off0000860e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860E 5416 bytes
SHA-256: cdcc81a18312381f835b1021a918292e2bdeb6258b391f16bd0358d85c2a2367
font_01_sfnt_off00009889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9889 10544 bytes
SHA-256: 30f91ce661370d6fde800f38e31488a23c7e743db498b579fb9951a513b5106f

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