Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b07b11e95f9431…

MALICIOUS

PDF

43.8 KB Created: 2020-10-11 00:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: afdc1688a3cd9536a13ff6f59c104452 SHA-1: 66d38097c3cf4223ca1ccfa495e2bc2e020369d4 SHA-256: a9b07b11e95f94310b0802695295ac6102b7fd306188fe5e7b1831fc5afb6943
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a message indicating a communication error, likely a lure to disguise its true purpose. It embeds a large number of links, many pointing to disposable hosting or known redirectors, suggesting a link farm designed to funnel users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and one embedded URL is known to be a malicious redirector.

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://cctraff.ru/strik?keyword=ha+sufrido+un+error+de+comunicaci%25C3%25B3n In PDF document text
    • http://files.jodileeart.com/uploads/1/3/1/3/131383771/9142525.pdfIn PDF document text
    • http://babotin.carinawingel.com/uploads/1/3/0/8/130813988/326659.pdfIn PDF document text
    • https://site-1045368.mozfiles.com/files/1045368/69263643310.pdfIn PDF document text
    • https://site-1036818.mozfiles.com/files/1036818/woxamu.pdfIn PDF document text
    • https://site-1036910.mozfiles.com/files/1036910/33120851396.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/5029192627.pdfIn PDF document text
    • https://site-1038504.mozfiles.com/files/1038504/genosuvodububeku.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/dde66f8f-fb00-438a-9958-da70ff029d28/fubakatogigexipesoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a515b2f4-a32c-4800-969d-df9d22af9f64/xutojavivofexopivoxitokow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e2a69f-2fd1-479c-a8c9-6f4c7d5a22e6/remivopivuramabat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491dba11-27cc-4554-ace1-0cada1272e9d/13928919692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cdebdbe-3919-4bfb-b36d-bf044060d765/vipamukefupewadu.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_off00006953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6953 5232 bytes
SHA-256: abad4ac441a1a40798494164ad7bbc0752e0b86ab8d6b7fa6c314a5aa3e15ad6
font_01_sfnt_off00007ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC5 11608 bytes
SHA-256: e0f00d7cc1bcd074f21acd29a96250ed11054870f726947a87593af8fad9f040

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