Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a55fd09b73c7d9c…

MALICIOUS

PDF

54.8 KB Created: 2020-08-20 21:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1be5ad88972fe946f86c52f538cbc19 SHA-1: e52642f65c2087446ff6fd7b2a140bcd37bed1c9 SHA-256: 5a55fd09b73c7d9c5ec519507c5032eb438e22ff3633b1bc34b37133910b535b
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 potentially malicious redirector infrastructure. The document body text, though garbled, includes a URL that is also present in the heuristics as a known malicious redirector. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware delivery.

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=form+acknowledgment+of+receipt+florida
    • http://nagusaze.serenesalonabq.com/uploads/1/3/0/9/130969915/8352696.pdf
    • http://navew.taiwanhotelnews.com/uploads/1/3/0/8/130813714/pumenixuwifo.pdf
    • http://tulonori.whollybananna.com/uploads/1/3/1/6/131606289/633569.pdf
    • http://sojuvaku.worldclasssurftrips.com/uploads/1/3/1/0/131070112/34a0dc17e0c4be.pdf
    • http://files.nysabaparent.org/uploads/1/3/1/3/131384573/negow_fipusadidujapit_giruxofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6341/files/juleruti.pdf
    • https://cdn.shopify.com/s/files/1/0440/1407/6069/files/post_office_size_guide_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/9538406994.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/indesign_recipe_book_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/5673729534.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1588/files/83653432354.pdf
    • https://cdn.shopify.com/s/files/1/0428/9147/7159/files/atomic_theory_notes.pdf
    • https://cdn.shopify.com/s/files/1/0459/2258/2679/files/cover_page_template_for_financial_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/9464/5672/files/42378338974.pdf
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/75398370.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_off00008dd2.bin
410ebd6a48c5c9481ca656b176ae2972d5e5107a0c44d60f2c8373f3ab56a865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD2 5408 bytes
font_01_sfnt_off0000a039.bin
2866af79f7bbc205f90aedae8e002df46978917c3fcf1881d2ff3cd93f9913d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA039 14720 bytes

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