Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffb43e364348aa0…

MALICIOUS

PDF

48.6 KB Created: 2020-10-10 14:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7c3c08eff68d5ad918e5e373532b1752 SHA-1: e9fa47f1b65332289964b251443b1fa958063a49 SHA-256: 4ffb43e364348aa0878862052d43648d6b0f0c43eb29dc9f4cc1aba72bd50f87
124 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier strongly flagged this sample as malicious. The document body, though heavily obfuscated, contains a URL that appears to be a redirector, suggesting the primary purpose is to lead the user to malicious content.

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://ttraff.link/pify?keyword=bk+butler+tube+driver+reviews In PDF document text
    • http://files.jasonrafferty.com/uploads/1/3/1/1/131163976/jufeparu.pdfIn PDF document text
    • http://files.jmgolfcoaching.com/uploads/1/3/0/7/130739153/dc857.pdfIn PDF document text
    • http://files.waimayyau.com/uploads/1/3/1/3/131381021/8775548.pdfIn PDF document text
    • http://nivabu.greaterdetroitoutreach.org/uploads/1/3/1/4/131408864/9716459.pdfIn PDF document text
    • https://site-1039632.mozfiles.com/files/1039632/97418483845.pdfIn PDF document text
    • https://site-1039838.mozfiles.com/files/1039838/52591978314.pdfIn PDF document text
    • https://site-1038691.mozfiles.com/files/1038691/juliviwuf.pdfIn PDF document text
    • https://site-1039725.mozfiles.com/files/1039725/kawaboxivikajozototegufes.pdfIn PDF document text
    • https://site-1036781.mozfiles.com/files/1036781/98099742891.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bc0115c7-90b5-494c-8899-08e815fa9286/jazuxupoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/473ccc57-e70c-499b-bc48-0b363902f1c2/58601769092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e262a85-7dc1-405a-9b48-11229502cf65/lesovigofumogibom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04479404-80af-4bab-bdce-0c7b6ca5f168/bisidudifeferov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c3ed34-0321-4ea2-ad20-dd105d01d537/xojaxufurizavexetek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71BD 4680 bytes
SHA-256: 046587dbbfbc8d494b3db57014a1ca940617c0ee9792f69b4521dbddded565d3
font_01_sfnt_off000081c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C9 10712 bytes
SHA-256: 07e78e53e0ae8bac8a1e57e17fc22764abcdecb85f2829d822ad8aa248cd3df7
font_02_sfnt_off0000a638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA638 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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