Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d271eff4e17fec…

MALICIOUS

PDF

40.2 KB Created: 2020-08-19 04:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d313eb78bcd7dccb8db1441a9cb03bd1 SHA-1: d5053a50a210be8df40c5d194cbbaf09995f0e88 SHA-256: 16d271eff4e17fecce1aa94704756b49639b3a9cc4506fdc18f4b2f867e1d720
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely for SEO poisoning or to lure users to malicious sites. The ML classifier strongly supports the malicious verdict.

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=mini+crib+sheets+canada
    • http://files.galleherlumber.com/uploads/1/3/0/7/130775373/kiwufokoweb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/60683659555.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5312/files/xudawinuzasabejujoxax.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/dudawudolenaka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/91912400371.pdf
    • https://cdn.shopify.com/s/files/1/0440/1309/3029/files/lending_money_to_family_contract_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5447/files/60117059107.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/australian_basketball_court_dimensions_in_meters.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_off00005fbc.bin
b97aff926dc8ab7a2e3d7aad90eee3cf66e7208805881307d6b14eec3fc3a05a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBC 5140 bytes
font_01_sfnt_off00007126.bin
f8a74dd96068c143e4ed9a2ef4dd90d5b6ad608a37648db93a54029bd5f5c6a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7126 10456 bytes

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