Malicious PDF — malware analysis report

Static analysis result for SHA-256 3050ce0ad2ebb330…

MALICIOUS

PDF

46.6 KB Created: 2020-08-06 19:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb05a328fd1649404143dac755b0c569 SHA-1: 38561548bba28f5d9f19c813fa1a1a7457ee627d SHA-256: 3050ce0ad2ebb3305e5c3f16b1c30c2480d9a5db8bd824ddccabc95fd36aba82
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Ortopedia pediatrica pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL is a high-confidence indicator of a phishing or malware delivery attempt.

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=ortopedia+pediatrica+pdf
    • http://files.wendyleedyart.com/uploads/1/3/1/3/131380814/2578f.pdf
    • http://files.karilagandancesociety.org/uploads/1/3/0/7/130776809/7153808.pdf
    • http://files.beingjewish.net/uploads/1/3/1/3/131383541/vetipi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2518/4421/files/warigemeroludaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/73011153529.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7414/files/cera_bathroom_fittings_price_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/69544591361.pdf
    • https://cdn.shopify.com/s/files/1/0436/2004/0866/files/bad_boy_mower_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9037/files/nekatumuwobini.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/53027005033.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7190/files/jimilinigegosofi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/cbt_for_health_anxiety.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4652/files/63660203191.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/najonozonosufijopuro.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/13216822207.pdf
    • https://cdn.shopify.com/s/files/1/0434/8857/5638/files/nuzurununo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8508/6374/files/zegeta.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_off00007250.bin
99105e3e22e0a286943e53c6581beb373f3375357bea951895667327e8420dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7250 4968 bytes
font_01_sfnt_off00008349.bin
3d64d416522b4dfe2ec3e382adb7886335d465bee6eeca07d58e708524f34bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8349 13556 bytes

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