Malicious PDF — malware analysis report

Static analysis result for SHA-256 8406c4339e3ca6fd…

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 06:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d8235265418a64c0078a423c057e709 SHA-1: 88b504cb3b48747d0b87a5b49f1cc3834062ad24 SHA-256: 8406c4339e3ca6fd5daf1481c93d14a7fcf897c961153e89af9d7d335d885b7e
154 Risk Score

Malware Insights

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

This PDF file contains embedded links that lead to a known malicious redirector, disguised with a keyword related to health. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of numerous external PDF links, as indicated by PDF_SEO_LINK_FARM, strongly suggest a malicious intent to redirect users to harmful content. The ML classifier also flagged this PDF with high confidence.

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/wix?keyword=core+exercises+herniated+disc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1619/9064/files/zegatoxijajivukuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/distance_vs_time_graph_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/10995212928.pdf
    • https://cdn.shopify.com/s/files/1/0434/7147/0742/files/pdf_da_4856.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/60776703756.pdf
    • https://static.usrfiles.com/ugd/b9801a_f822cec7e469410da2073d984aceebba.pdf
    • https://static.usrfiles.com/ugd/b8c837_aafbd17cb98245e3a07b59be7b774e56.pdf
    • https://static.usrfiles.com/ugd/b8c837_abfe37e54dff42e3aee07f00ad91b977.pdf
    • https://static.usrfiles.com/ugd/5ecadc_fb111b0cc250412990b283382b4e621f.pdf
    • https://static.usrfiles.com/ugd/b8c837_4de5c01c304244a2830e8bc241186176.pdf
    • https://static.usrfiles.com/ugd/b8c837_63be9aad80654b8fbedc3e38fa9dc152.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96626323422.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/wubogokujatifofam.pdf
    • https://cdn.shopify.com/s/files/1/0433/5019/6392/files/bernoulli_s_theorem._file.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/vaxamezivaritokidewudif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006335.bin
ff7f3f9986dcadc91c3e9fcf13bf6bbbcf46428140ef8dd83856844299b4820c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6335 4872 bytes
font_01_sfnt_off000073b2.bin
12378ad5a5003ff67d5fb73aa7529d66176036478028d83ebd3a1b2de033c5cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 10204 bytes
font_02_sfnt_off0000968c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968C 4324 bytes

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