Malicious PDF — malware analysis report

Static analysis result for SHA-256 028c51813b0e7715…

MALICIOUS

PDF

48.4 KB Created: 2020-08-24 14:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c073222f6ef2f9e298bc7b05dec3f55 SHA-1: 74aacb376ac0d3fab103c323bedccb1eaf828500 SHA-256: 028c51813b0e7715e91604b75bdc7c96af723286ee783f10274ce29bf3e854c8
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated but contains the malicious URL, suggesting a lure to external content.

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.com/pify?keyword=fitbit+band+size+guide
    • http://files.jacwellness.com/uploads/1/3/2/7/132741556/ba5fc.pdf
    • http://files.gregoiremazars-folio.com/uploads/1/3/1/8/131856160/jorabizaxobu_xukokufesar_virunek_fudet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0996/6239/files/vuvanukagemeniluxegeduxup.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/ripoxuzufetavemumawubali.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/80451854340.pdf
    • https://cdn.shopify.com/s/files/1/0430/6527/8625/files/mazekefekuvekuteronu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/adjective_adverb_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4494/5571/files/kali_linux_tools_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/68987568317.pdf
    • https://cdn.shopify.com/s/files/1/0429/6753/1673/files/sejavibalafokabisimij.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6147/files/can_can_t_with_adverbs_of_manner_exercises.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_off00007fb4.bin
5d66a69da3790e6e95e24fe18ff791a556df0fadd9746566aa34e4ff56979978
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB4 5012 bytes
font_01_sfnt_off000090d3.bin
c51b04130cdd7fe435d17affd9e59396cd6b2e5ce3541d66280951e3b8f86dca
pdf-font-stream PDF embedded font (sfnt) at offset 0x90D3 10652 bytes