Malicious PDF — malware analysis report

Static analysis result for SHA-256 600bd408b9c70478…

MALICIOUS

PDF

56.7 KB Created: 2020-10-06 10:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4bdacf3d06ec3935c72db527965204fb SHA-1: 9744cd0ed73f6c3dbd05ff7926affbfd5aefcb60 SHA-256: 600bd408b9c70478e8a248c4f5e3bd3d5320b6cc02266bc340a60dedb58369be
184 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://gettraff.ru/strik?keyword=roll20+export+character+sheet+to+pdf, which likely serves as a redirector to further malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of these link farms and redirectors.

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://gettraff.ru/strik?keyword=roll20+export+character+sheet+to+pdf In PDF document text
    • https://site-1039707.mozfiles.com/files/1039707/bulofegatidebenuz.pdfIn PDF document text
    • https://site-1037138.mozfiles.com/files/1037138/razopakubinoromejubowito.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/xusovarezuxovorifemalom.pdfIn PDF document text
    • https://site-1038771.mozfiles.com/files/1038771/96789756956.pdfIn PDF document text
    • http://sikawapu.thebrainyblonde.com/uploads/1/3/0/9/130969862/157b87115.pdfIn PDF document text
    • http://nuwokumeb.apachetrailchapter.org/uploads/1/3/1/1/131164112/fupuwipujas-goroz.pdfIn PDF document text
    • http://gufupubo.illuminat.co/uploads/1/3/1/4/131483154/gozada_tevajojesid.pdfIn PDF document text
    • http://files.acanthusfloral.ca/uploads/1/3/1/3/131384166/7863754.pdfIn PDF document text
    • http://ruxul.montereybaycaststone.com/uploads/1/3/1/0/131070272/1738031.pdfIn PDF document text
    • https://site-1040299.mozfiles.com/files/1040299/63603965292.pdfIn PDF document text
    • https://site-1040878.mozfiles.com/files/1040878/41502313719.pdfIn PDF document text
    • https://site-1038880.mozfiles.com/files/1038880/50138632119.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/1/0435/8638/8136/files/73549598160.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8774/1599/files/94956465715.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_off00009d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D72 5592 bytes
SHA-256: 284c8e8b4979dd817edfed17f0ab51dee19210e0cc0c6795a0400c0062f8a7c7
font_01_sfnt_off0000b078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB078 10860 bytes
SHA-256: c6ee7207e95a16d30b354a3b25d70bc2eb853f20a1b864c28468eb0804e0149b

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