Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77aee6b71636ad5…

MALICIOUS

PDF

59.1 KB Created: 2020-08-22 14:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d66bb3eecc82e327287aac2b0650de67 SHA-1: fda53dda030e3662e9f5e5ee9618c7677c4889e0 SHA-256: e77aee6b71636ad57c8f365cb52e8eb3f637c9e78aba5313f9c21ef3a2d99aea
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically targeting educational keywords. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates a direct link to a known malicious redirector, and PDF_SEO_LINK_FARM shows a mass of external PDF links, many hosted on Shopify. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=high+frequency+words+5th+grade+worksheets, which is the primary lure.

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=high+frequency+words+5th+grade+worksheets
    • http://mijimudol.annethomassen.com/uploads/1/3/1/0/131070381/xegol_xidikuxix.pdf
    • http://zifugo.flholmes.com/uploads/1/3/1/4/131482995/rixetedexif_ribojubawerupal.pdf
    • http://pupefinax.robynpforrryan.com/uploads/1/3/2/6/132696063/pegekepogon.pdf
    • http://dagut.akenkan.org/uploads/1/3/1/6/131637814/55b5d.pdf
    • http://files.roundtheworld4jo.org/uploads/1/3/1/4/131453588/sekilagoxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3894/files/vipegegezopobixivarat.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/depuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/sudok.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4255/files/linux_assembly_language_programming.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/selanupaxumevaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6715/files/78080740426.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/19785409299.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6216/files/sefupebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/72739306975.pdf
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/sikopolar.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000090d7.bin
3ea9dc0fe5daeba8b7c1286de8752a991578e51b79301a8010be3d8f06b4997c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D7 3080 bytes
font_01_sfnt_off00009bdf.bin
f9f306934c7d83f6a87c9c30475e637cb268865d6adb5a3c5536f1787a02d5cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDF 5604 bytes
font_02_sfnt_off0000aef8.bin
f9b609bac3472c39c80a1b7c8f2c9baa052b987c845f5cf326d60c4d38111c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF8 9876 bytes
font_03_sfnt_off0000d0c5.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C5 4324 bytes

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