Malicious PDF — malware analysis report

Static analysis result for SHA-256 14070ad8e7c1e482…

MALICIOUS

PDF

38.6 KB Created: 2020-08-05 16:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca4d7514636d293edfff75564035920c SHA-1: b3828aa0ec6f134e929225f81c056bf7a885cb28 SHA-256: 14070ad8e7c1e482615c165b96303a6d786962678ec30fc7dee9a4714a91cdff
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to benign Shopify domains, but also includes a critical link to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure suggests an attempt to trick the user into clicking the malicious link. No scripts were extracted, but the overall structure indicates a link-farming or redirection attack.

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.com/pify?keyword=can+you+add+text+to+pdf+document
    • http://bojaj.metrochristianlegalaid.com/uploads/1/3/0/7/130776485/477272.pdf
    • http://files.montdeoliviersleglisededieu.com/uploads/1/3/1/4/131453943/1145d5e5cf2296.pdf
    • http://files.sentinelshadesystems.com/uploads/1/3/0/8/130813827/c4dfe44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/line_width_ggplot2.pdf
    • https://cdn.shopify.com/s/files/1/0428/8331/7926/files/bajunam.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/79538827424.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2759/files/18680470288.pdf
    • https://cdn.shopify.com/s/files/1/0438/1786/1277/files/18286870073.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/87106450932.pdf
    • https://cdn.shopify.com/s/files/1/0430/8100/7255/files/pixoveterobagitajasapanik.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7202/files/ar._js_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/zofulez.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/defensa_nacional_monografia.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/bujokusajodosewetegufubu.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_off00005a84.bin
d930d6829d95410cfca6aab5eef40c1e20dc1b807df4e2c426bac0732bfd35e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A84 5068 bytes
font_01_sfnt_off00006bc9.bin
4877e2dfdd9b9520a4d6fb95f473707b9a84bef926fc12703956d367d5612798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC9 9884 bytes

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