Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f81c1b23e510df4…

MALICIOUS

PDF

47.3 KB Created: 2020-08-07 01:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9bdffbce0ff721f6dfb4c81c333c05f SHA-1: 3310ae36468466270cd3f857bf2450cce9b38b1a SHA-256: 8f81c1b23e510df41122d51a291331e144e29437c1f0af2bb5ee103300a42734
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links, including those to Shopify domains, suggests a link farm or a method to obscure the true destination of malicious payloads. The document body itself is heavily obfuscated and contains what appears to be a URL, further supporting the malicious intent.

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=complementi+analisi+logica+pdf
    • http://files.davediamond.co.uk/uploads/1/3/0/7/130776578/deworilaku-jefijuxet-pidasotazumi.pdf
    • http://files.islandbeautyportland.com/uploads/1/3/1/6/131637016/segalikefit_faresodewo.pdf
    • http://files.yiranchen.com/uploads/1/3/0/7/130776795/wuruga.pdf
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/msi_b250m_bazooka_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2251/files/modelo_de_intervencion_psicosocial_en_trabajo_social.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/82356333295.pdf
    • https://cdn.shopify.com/s/files/1/0435/4267/5608/files/viwitanuzup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/zuruxoxurirudu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdf
    • https://cdn.shopify.com/s/files/1/0438/4312/5405/files/joziwuxefapavotogepajutu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/27251292813.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/ret_paladin_pvp_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8980/files/sejarah_kota_malang.pdf
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/koxasaguxodegavida.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0440/5847/6694/files/teen_wolf_songs.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/1/0434/6429/4557

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bba.bin
e70b6c09140e33d9eea2bf43a1de7526ad53198babc40a6842751405add77b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBA 5188 bytes
font_01_sfnt_off00007d4c.bin
bffa065f9aa1e9650b8f5e0720b76d00f6714d33797b66f121326b0f5b3b26e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4C 10728 bytes
font_02_sfnt_off0000a053.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA053 4324 bytes

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