Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5c2088c151505c…

MALICIOUS

PDF

38.7 KB Created: 2020-08-22 12:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 759126dc0daa4d4ce87fa22b014f24f0 SHA-1: 0089f56216b9862715696cf460f2d96c53aa6db8 SHA-256: 0a5c2088c151505cc2148e3476ce11603f42ac4a5c2dc5f8f45942fabf78d845
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to potentially harmful sites.

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/pify?keyword=phonics+worksheets+for+kindergarten+vowels
    • http://jokufesis.iwfmasters.org/uploads/1/3/2/8/132815176/3183290.pdf
    • http://files.larte.us/uploads/1/3/1/3/131398097/wetedifot.pdf
    • http://joluko.healthandlibertysolutions.com/uploads/1/3/1/4/131482976/wemasatebuj_kuziruxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/guacamelee_super_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/72850241452.pdf
    • https://cdn.shopify.com/s/files/1/0433/9594/0519/files/jexudu.pdf
    • https://cdn.shopify.com/s/files/1/0450/0901/0852/files/fofaxefizijizem.pdf
    • https://cdn.shopify.com/s/files/1/0432/6444/2521/files/back_out_synonym_formal.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/jigakoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/fozibe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/dwarf_fortress_armor.pdf
    • https://cdn.shopify.com/s/files/1/0429/5426/0643/files/52695832746.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/tepiniwepobetuj.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_off00004e31.bin
b7e81078ca1921b06bc7b57a8682ea0fc8d8ab2df7f8ec833f8df47aae0587ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E31 3144 bytes
font_01_sfnt_off00005954.bin
7d87d994d4ac13c14dc2e2306f2b195413f2f82908c288e7b320e091c0d45681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5954 5500 bytes
font_02_sfnt_off00006c10.bin
a60ad8fc8f39e6a380f088eeb70dfa3c4e0bfc649348cc0a909aff87330f1fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C10 9792 bytes

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