Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e87badfcb14802…

MALICIOUS

PDF

38.3 KB Created: 2020-08-25 13:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc5a4e81b58f521257cd8ecfbdb4203a SHA-1: bc8f82a7f02a16f942cba6ac4d9b0ffba88b19ef SHA-256: 62e87badfcb1480257d1e1022266f786d6897a81f38aba73078e93f8d29d886b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=brandt-+daroff+exercises+for+bppv+pdf
    • http://files.paulwesselhoft.com/uploads/1/3/2/8/132815183/6533243.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/61020879198.pdf
    • https://cdn.shopify.com/s/files/1/0434/5551/2738/files/vijenipelixozadisuxojuki.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/zufekalasumejomarifolivuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/9761/0657/files/34545533717.pdf
    • https://cdn.shopify.com/s/files/1/0440/2973/9173/files/4543813810.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/suniginaluzavonobovejak.pdf
    • https://cdn.shopify.com/s/files/1/0430/9857/0909/files/bubaje.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8920/files/52817137384.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0639/files/moforotesezoleze.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_off0000594d.bin
a33df72571ae875b504af2149a3f18f311719b5cc2cd342a8def6128ac082598		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594D 5464 bytes
font_01_sfnt_off00006bfe.bin
a9eb693a58a54b3a3722e5ad5bb2b3afae8c327ed79fd5f13ca655cef3959d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFE 9984 bytes

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