Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b93a3e5bf77c825…

MALICIOUS

PDF

40.3 KB Created: 2020-08-24 21:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b74abe67a7ec84d1364dd9c255b735d5 SHA-1: 352fde429911b1411ff6a9528c3c2215f99f31f6 SHA-256: 8b93a3e5bf77c825fefe46b7ad769d0c42e2fb0d091f456df92775fc696f0415
150 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a TOEIC answer sheet, which redirects to a known malicious infrastructure. The PDF also contains a large number of embedded links, many pointing to Shopify, suggesting a link farm or SEO manipulation tactic to increase visibility. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=toeic+answer+sheet+pdf+2019
    • http://files.classicalteachingtextbook.com/uploads/1/3/0/7/130739309/wezodib.pdf
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/renanaxesarukeke.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6295/files/videoder_apk_link.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/940569745.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/business_english_course.pdf
    • https://cdn.shopify.com/s/files/1/0444/2567/4919/files/english_reading_comprehension_book.pdf
    • https://cdn.shopify.com/s/files/1/0464/6597/4424/files/9782774979.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/88759358446.pdf
    • https://cdn.shopify.com/s/files/1/0434/2828/2529/files/autotune_free_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/adobe_photoshop_cc_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdf
    • https://cdn.shopify.com/s/files/1/0434/1484/7655/files/calendario_2020_con_feriados_argentina_para_imprimir.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058f7.bin
18bdb37291c3ea939c384fed366f064fc20163d73d7ed6f0d0b5bf35853b68c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F7 5732 bytes
font_01_sfnt_off00006c8c.bin
2bd7019a6705d264870fe7b673ff248c925db2551ded3f8d2c63f3324a2aaf68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8C 14096 bytes

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