Malicious PDF — malware analysis report

Static analysis result for SHA-256 81689bc3f318c346…

MALICIOUS

PDF

60.1 KB Created: 2020-08-07 05:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16616e47945c042eb9f3f3960abb82ac SHA-1: 16bcae2550207c69f84f09315bbfbe606126385d SHA-256: 81689bc3f318c34664294ed9ce51f37f2b559a7bec75b7ae762943e521079962
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 'ttraff.com' URL. The ML classifier strongly indicates malicious intent, and the PDF structure itself is flagged for containing a mass of external links. The embedded URL 'https://ttraff.com/pify?keyword=aprendizagem+baseada+em+projetos+livro+pdf' is the primary indicator of this redirection-based attack.

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.com/pify?keyword=aprendizagem+baseada+em+projetos+livro+pdf
    • http://files.heartsindixie.com/uploads/1/3/2/6/132681713/bivuvipupivujiralud.pdf
    • http://files.ailienvuong.com/uploads/1/3/0/9/130969310/2249e2d.pdf
    • http://files.countrysquireinn.com/uploads/1/3/1/0/131070178/xaxoliwixurawiz-sadowuzi-wofavuzuvositib-pufuvej.pdf
    • http://zosozez.mindfulteachermindfulstudents.com/uploads/1/3/2/6/132683014/5440875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4709/9287/files/gewifitifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9464/6689/files/47460458319.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/35980765455.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/tvpad_usa_dns.pdf
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/bolawirezasoxozisafow.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/vifepujizadobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1675/files/valumavurozapoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7226/6138/files/92392919515.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7264/files/29572354578.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/gawusiniju.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/69217308553.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0815/files/express_js_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/23446942544.pdf
    • https://cdn.shopify.com/s/files/1/0437/2519/3368/files/punibiladularufirulaxo.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_off0000a589.bin
54318882a3eeef1d9fdcae5e53572cd080c703fd3be1472bd139022f3ea0c424		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA589 5676 bytes
font_01_sfnt_off0000b8d8.bin
3765edee217abcd772863b7e9e3a0f2b5c58efa0b4f7a4f1aa4fda50e62435bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 13164 bytes

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