Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b12a4d004dbe434…

MALICIOUS

PDF

45.4 KB Created: 2020-07-09 02:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5304aea87127ba7675da2c024abce46 SHA-1: f28da408a1cc3ecd8badbc59a1e7937906cb40a8 SHA-256: 5b12a4d004dbe434c33220b52ff9e261025cd23f03054c8004a39e052e957713
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 various external PDF files, masquerading as a review for 'Soda PDF Home'. One of the primary links, 'https://ttraff.ru/wb?keyword=soda%20pdf%20home%20review', is identified as a malicious redirector. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or SEO-based malicious link distribution campaign.

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.ru/wb?keyword=soda%20pdf%20home%20review
    • http://files.lilachbar-ami.com/uploads/1/3/2/3/132303075/06abc032.pdf
    • http://files.stephaniegonzalez.org/uploads/1/3/0/8/130873907/kezafajilofem.pdf
    • http://files.themoveablechurch.org/uploads/1/3/0/8/130874128/9175303.pdf
    • http://files.lifewisegifts.com/uploads/1/3/0/8/130874128/6ab8d3.pdf
    • http://files.fccwareham.org/uploads/1/3/2/7/132740860/4414195.pdf
    • http://files.tezpurgurukul.com/uploads/1/3/1/8/131856176/3777112.pdf
    • http://files.moonspellgirl.com/uploads/1/3/1/3/131379085/a21a362.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bekakum.files.wordpress.com/2020/07/74662769930.pdf
    • https://bewapixez.files.wordpress.com/2020/07/32130089074.pdf
    • https://rebofowi.files.wordpress.com/2020/07/sivezafiburojal.pdf
    • https://botefet.files.wordpress.com/2020/07/49790666518.pdf
    • https://botogaxe.files.wordpress.com/2020/06/wazunaledalu.pdf
    • https://vejaxupasen.files.wordpress.com/2020/07/27627630672.pdf
    • https://zixutegavew.files.wordpress.com/2020/07/fubavewuwewize.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.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_off000075b5.bin
fe459dc72c479e01998718ea3bbd208cef0462af813ea1cc87b29114ec6112cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B5 4928 bytes
font_01_sfnt_off00008684.bin
58eb7e5610a465e32bc5814871ad8f76334bd3d4fa88cbd7ffb87e8c26865e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8684 10056 bytes

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