Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab305a748de71a2f…

MALICIOUS

PDF

38.8 KB Created: 2020-08-19 05:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14da98dbac2f1aa697d929d27801ae6c SHA-1: edc0032dc8453f30a7a724a5e933ade258341390 SHA-256: ab305a748de71a2f91ab403329100041a4edbd9f06d5f7bd5727ebef9884fecb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting a lure for users to download potentially malicious content disguised as an installation guide. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting a malicious distribution or SEO poisoning tactic.

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=erdas+imagine+installation+guide
    • http://files.thegorsebush.com/uploads/1/3/0/8/130814118/1048625.pdf
    • http://gixat.heartclub.com/uploads/1/3/0/7/130776659/vavobenu.pdf
    • http://files.danielsuniqueartforms.com/uploads/1/3/0/9/130969680/gajozereginetekuxa.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/79859055985.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/41146788245.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7578/files/bus_166_nj_transit.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/jalozakapudirorikipamomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/ascii_table_hex.pdf
    • https://cdn.shopify.com/s/files/1/0434/0970/3062/files/borland_c_builder_4._5.pdf
    • https://cdn.shopify.com/s/files/1/0440/4704/0662/files/process_costing_examples.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b7c.bin
bb709a90b5cfdd53523dde273c53ddac61be54ee18d5b56e943741de3c9c3c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7C 5100 bytes
font_01_sfnt_off00006cb6.bin
839ab48ed104a240f3709dc255fafba31bf9c2bed90c86bb9388a6c809a72a7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB6 9776 bytes

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