Malicious PDF — malware analysis report

Static analysis result for SHA-256 e972e00062268bf1…

MALICIOUS

PDF

65.0 KB Created: 2020-09-30 20:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 410682d15533530f25f4c0b047fdbb1a SHA-1: fcc4c157a5b7d33099484494ee26a7c89a9bd27b SHA-256: e972e00062268bf162a9220a78e519e513831ee684c1f265c04404c290625cef
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to suspicious domains and redirectors, indicating a link farm designed to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links confirms a malicious intent to direct users to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=buckling+of+columns+pdf In PDF document text
    • http://files.fixthepilotshortage.com/uploads/1/3/1/1/131163610/833e56fa6bd4e7.pdfIn PDF document text
    • http://files.paulhaddadbooks.com/uploads/1/3/1/4/131406108/kojup.pdfIn PDF document text
    • http://files.kikayscleaningservices.com/uploads/1/3/0/7/130739648/lifijepijuza-jajoru-samamepi-fuzokafetipex.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/76995638030.pdfIn PDF document text
    • https://site-1038439.mozfiles.com/files/1038439/47987855379.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/32409870231.pdfIn PDF document text
    • https://site-1036731.mozfiles.com/files/1036731/mapenejugeliwozidej.pdfIn PDF document text
    • https://site-1038401.mozfiles.com/files/1038401/29073299140.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/1/0434/8113/7316/files/the_charles_schwab_guide_to_finances_after_fifty.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/honesty_is_the_best_policy_story_in_english_for_class_8.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA966 5280 bytes
SHA-256: 39d1ef5e2976725b21ba7ce0f9cc732aff1269cd6eb49bfd3f9f6b7734628c6d
font_01_sfnt_off0000bb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB63 11376 bytes
SHA-256: 54c875cd1c2bab2a5b353b6aabde21cd8c233c60ab2ba27d2acdefd9ba885c47
font_02_sfnt_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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