Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1b50cdfcac63b6…

MALICIOUS

PDF

36.4 KB Created: 2020-08-12 15:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ee9535550797fbee64845eedfe7c892 SHA-1: f1b3f10da18f0f0f379fd0fb02823faad93fe8c2 SHA-256: 5e1b50cdfcac63b66d9fb501c22b5711fe326caf5f4a774fd8155660e165a953
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, disguised as 'biostatistics pdf notes'. It also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly indicates maliciousness, and the overall structure suggests an attempt to drive traffic to malicious sites or distribute further malware.

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=biostatistics+pdf+notes
    • http://files.eygbball.com/uploads/1/3/1/6/131607467/b9d3217.pdf
    • http://ralepij.saintgeorgechurchok.org/uploads/1/3/0/8/130874359/tixuxanesal.pdf
    • http://files.christopherlewis.net/uploads/1/3/1/3/131398291/5301a9dc7f56310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/vekulizimegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/44574425914.pdf
    • https://cdn.shopify.com/s/files/1/0434/5354/6656/files/revista_natura_ciclo_15_2020_argentina.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexanenivoxepabulolud.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/guia_para_aprender_espanhol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9223/0823/files/zekaxojekibivuses.pdf
    • https://cdn.shopify.com/s/files/1/0440/4966/2117/files/cambridge_international_dictionary_of_phrasal_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/95596516571.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/92999971458.pdf
    • https://cdn.shopify.com/s/files/1/0428/9862/0569/files/gamunoxubijimajowujodu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/linitinexomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3920/3229/files/87549540928.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/13591276092.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_off000050dc.bin
8ce8bb045ed0e61908fb9895828e13c8f4ef310c8e2af3731c32bbbdccc2ee64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50DC 5072 bytes
font_01_sfnt_off0000622d.bin
8e8620905ac14f9a3352ff6ccd3d97b0fe961e945cec70b31fb28eb43a19d1ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622D 10716 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.