Malicious PDF — malware analysis report

Static analysis result for SHA-256 64206e40e46e265a…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 06:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4955539beeb5b34536c1695022855686 SHA-1: 94513b4feec4372fb877d212b752c404cb39a69d SHA-256: 64206e40e46e265a48380160ea7812f158376d1af5c55a4967f94007be5dae3e
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, including one pointing to known malicious redirector infrastructure. The document body, while appearing to be educational content, is a lure to direct users to these external sites. The presence of multiple links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful 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 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://ttraff.ru/wix?keyword=actividades+de+acentuacion+de+palabras+agudas+graves+y+esdrujulas+para+imprimir
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/764aaa_1df65544cf9c45f69ce8711b2ba3d95d.pdf
    • https://static.usrfiles.com/ugd/c7a620_8bb4ce78b68a4f8a99fc5ca2154bc3ef.pdf
    • https://static.usrfiles.com/ugd/565485_1782684ad3e74860953b11d9b18607fe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7669/files/lexum.pdf
    • https://cdn.shopify.com/s/files/1/0437/6684/1505/files/kepamuwamivij.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/pawodibotota.pdf
    • https://cdn.shopify.com/s/files/1/0438/9234/2939/files/relevance_and_admissibility_of_evidence.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/fejomanilinekenulurotele.pdf
    • https://cdn.shopify.com/s/files/1/0458/1258/0518/files/20498284125.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2305/files/vorotogilomogurofiwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3701/5719/files/acid_base_and_salt_class_10th.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6589/files/nozogefituvazivig.pdf
    • https://cdn.shopify.com/s/files/1/0462/8126/1205/files/66672172218.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/beginner_english_book.pdf
    • https://cdn.shopify.com/s/files/1/0446/5029/9555/files/pica_de_atrahasis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066bc.bin
e2bf98f38ea493d2b3a64df9984f3b5feeef6d3a6c065148572d9f9f0132d9e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x66BC 5760 bytes
font_01_sfnt_off00007a3e.bin
33e5747ad603c92b7e603e19d27db7fa84be93497a35cc28a7c8765208e48d7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3E 10552 bytes