Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d2c423aebe08d4…

MALICIOUS

PDF

52.7 KB Created: 2020-08-25 00:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ae2c1a047ac5301ab3e44b7ea4a725 SHA-1: 846e078eeb2fa76acd3bdafb6f1ae6ed672f492a SHA-256: 16d2c423aebe08d4be198348810e90e095e9effb0fcec4079823d2da858ecd75
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a lure for a 'free excel spreadsheet'. The presence of a download button lure further supports this. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=free+excel+spreadsheet++for+mac
    • http://lunum.qwikpicz.com/uploads/1/3/0/8/130814575/bezut.pdf
    • http://files.hunterjkeane.com/uploads/1/3/2/7/132740278/a5cd0399f9f32.pdf
    • http://jeragu.digitalmortgageloan.co/uploads/1/3/0/9/130969306/643245.pdf
    • http://vilefi.ethnolibrary.org/uploads/1/3/1/4/131453062/vuwilevowuxi_mimunasukax.pdf
    • http://files.instantresultswithkate.com/uploads/1/3/1/8/131859042/dulivi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/86537924422.pdf
    • https://cdn.shopify.com/s/files/1/0437/7310/0184/files/ati_teas_study_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/sugorojirosubenuze.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/lifubofufopadodil.pdf
    • https://cdn.shopify.com/s/files/1/0441/1473/9352/files/42622781042.pdf
    • https://cdn.shopify.com/s/files/1/0432/0804/8808/files/zujegileledatazijalufonu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1987/files/51849215447.pdf
    • https://cdn.shopify.com/s/files/1/0437/0936/6427/files/bujiwitedo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/xibikapubugukixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/68739626815.pdf
    • https://cdn.shopify.com/s/files/1/0431/9507/2673/files/b_tech_information_technology_uj.pdf
    • https://cdn.shopify.com/s/files/1/0440/3258/9989/files/fanotim.pdf
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/19998323108.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_off0000901d.bin
ebed176683122274b04903d083d4d2bdc3aa9247aa5d765da7fdd7bc14657ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x901D 5416 bytes
font_01_sfnt_off0000a268.bin
0f8e7d3fed4984f7768d01f1901f813ac5dee9f42d65d18df7aadf4c27be5d5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA268 10316 bytes

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