Malicious PDF — malware analysis report

Static analysis result for SHA-256 14719e426b7161a5…

MALICIOUS

PDF

37.1 KB Created: 2020-08-10 07:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3fba77315d92f88550475704443a1aa SHA-1: 8a9d171e85db40ed6a3d89bf07f6bbe1dbfde69e SHA-256: 14719e426b7161a5376a0dfa5889dc820db9d065fd6cb287ebb38197ef8aaae9
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.ru/pify?keyword=indonesian+to+english+dictionary+pdf. This technique is often used to obscure the final malicious destination and distribute traffic. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a malicious intent to redirect.

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=indonesian+to+english+dictionary+pdf
    • http://files.thebenjaminjohnstephensfoundation.org/uploads/1/3/1/8/131856956/mudebativojivibovu.pdf
    • http://pabuduge.classicalcollege.com/uploads/1/3/1/0/131069839/c99727c.pdf
    • http://files.davidemariano.com/uploads/1/3/2/6/132681694/12d8564.pdf
    • http://butit.ivocc.org/uploads/1/3/0/8/130874431/9f720f29e37d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/41562421232.pdf
    • https://cdn.shopify.com/s/files/1/0435/4208/5783/files/10821819107.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/beneficios_del_pinzamiento_tardio_del_cordon_umbilical.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/zumofuza.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4011/files/39553964508.pdf
    • https://cdn.shopify.com/s/files/1/0438/6678/3904/files/grupo_de_antibioticos_betalactamicos.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/how_to_create_discord_server.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/54654237397.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/alagappan_medicine_book_pdf_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/kalopoditakaku.pdf
    • https://cdn.shopify.com/s/files/1/0437/1972/1115/files/chiquinquir_c3_a1_delgado.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_off00005229.bin
2ae08c573dbf14529f1c8b6cefcec551dff17ac2dfb2456cd724051f006b546f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5229 5456 bytes
font_01_sfnt_off000064bd.bin
17ade4feac412b5577569d76bbd6f033e68ca152d6b8f5ecdfe8750dff61ecac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BD 10064 bytes

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