Malicious PDF — malware analysis report

Static analysis result for SHA-256 0850d9454e134be2…

MALICIOUS

PDF

47.1 KB Created: 2020-08-12 20:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0eae5c50f3c0ee98fcabe552b280054 SHA-1: e5b208912fb855d6f2fcfc7d7d9c56a6e84b893c SHA-256: 0850d9454e134be2fa2d1e8ca99a25399168711a53d00e923252b8346eb47a2e
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting an attempt to game search engine results for malicious purposes. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=chemistry+laboratory+equipment+pdf
    • http://files.themudlakeproject.ca/uploads/1/3/1/4/131407665/2735271.pdf
    • http://paripijup.metranengineering.com/uploads/1/3/1/3/131383657/6b5b784198.pdf
    • http://files.pro-help.co.uk/uploads/1/3/1/3/131380343/vupin.pdf
    • http://jalelafab.hollyterrens.com/uploads/1/3/0/8/130874038/wodevemise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/35437330185.pdf
    • https://cdn.shopify.com/s/files/1/0432/3275/5875/files/another_word_for_starting.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/support_vector_machine_theory.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/nupotu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5482/4598/files/metal_casting_process_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/30753668196.pdf
    • https://cdn.shopify.com/s/files/1/0430/7684/5728/files/veguwabutenuzom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/tunaxabi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3841/4760/files/21044673346.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/sipuwotewurawuten.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/27618769802.pdf
    • https://cdn.shopify.com/s/files/1/0437/4809/8209/files/16375016070.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2635/files/litabagonojorinenovev.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_off0000796e.bin
3fa12c94499220d13c0a67213a15cb5b739a2fb7dd7f0cbb0fd41a82bd7976a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796E 5552 bytes
font_01_sfnt_off00008c18.bin
ae310f428f02e7f1544d1c8459b6179ec82744f83711c4eff15bf4bac50fe81a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C18 10192 bytes

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