Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a339519285ed937…

MALICIOUS

PDF

41.3 KB Created: 2020-08-21 17:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f857b84e488742b217e030c95b68522a SHA-1: 8977e66b477eb0cef2f732199e0d3bb08e811ac9 SHA-256: 9a339519285ed93766ef2471015d47364c4c844729c24b6a47b0b9afd0f172e8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links pointing to various PDF files, many hosted on Shopify domains. One of the primary links redirects through 'ttraff.ru', a known malicious redirector, suggesting a malicious intent behind the link farm. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the target URL, reinforcing the link farm and redirection findings.

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/pify?keyword=year+calendar+template+excel
    • http://nikeweref.archildrensbookpublishing.com/uploads/1/3/1/4/131437130/xumuwusen.pdf
    • http://mezor.sundayswimmingacademy.com/uploads/1/3/2/7/132740405/0d5e6a38.pdf
    • http://solejaxu.lhfministries.com/uploads/1/3/2/8/132815028/rugon-kofunofi.pdf
    • http://files.calicocreekfeedandpets.com/uploads/1/3/0/7/130739444/wamisobupitop_vamavisaxakav_rodonodu.pdf
    • http://files.supernovabaton.com/uploads/1/3/0/8/130813108/delosidijimofezot.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9622/files/31631717136.pdf
    • https://cdn.shopify.com/s/files/1/0429/6487/7471/files/56353031764.pdf
    • https://cdn.shopify.com/s/files/1/0437/6880/7586/files/jolatezupeloseb.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0476/files/jisititudi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/12634811212.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3214/files/kiran_bank_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9048/files/vubarepoxonekotowowek.pdf
    • https://cdn.shopify.com/s/files/1/0428/3265/8588/files/27654881287.pdf
    • https://cdn.shopify.com/s/files/1/0432/7974/5192/files/37856571393.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/35172754063.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/teganolejinewod.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1278/files/pexelelirozexosizibodikef.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/fonctionnement_de_l_appareil_gnital_fminin.pdf
    • https://cdn.shopify.com/s/files/1/0435/3330/3976/files/tesis_de_administracion_publica_peru.pdf
    • https://cdn.shopify.com/s/files/1/0462/3826/9591/files/fuzunarusaxadisekipuzavez.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/
    • https://cdn.shopify.com/s/files/1/0435/3330/3976/files/t

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000653e.bin
0deb0bb300f1f9bed84114df8fca511f45a5c0ee93f6b4ae0f7e052fa053a648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653E 5072 bytes
font_01_sfnt_off00007665.bin
5460f4b939bffaf95d97f64c7a62b008ac92866aa3a58519770ced4212f8665c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7665 9896 bytes

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