Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd16dcc3a3e1448a…

MALICIOUS

PDF

72.5 KB Created: 2020-08-13 07:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17e7299042a566509040fbea619ffd01 SHA-1: 9205b537aa8483eb707d787cc6ecbbd1b9d13291 SHA-256: bd16dcc3a3e1448ad544c6cace66034b6d9a6e83af0eefa214bd04f5e32c0373
152 Risk Score

Malware Insights

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

The PDF contains a link disguised as a piano music sheet, which redirects to a malicious domain. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this redirection to a known malicious site. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a spam or phishing campaign. 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/wb?keyword=piano%20music%20sheet%20for%20beginners%20pdf
    • http://kamat.orlove.co/uploads/1/3/1/6/131636725/pagusisaratokarizab.pdf
    • http://files.goorooglass.com/uploads/1/3/1/6/131636625/misepopowoj-bikivajetoguw-sinix-tifiwudepima.pdf
    • http://jugureni.sukhikitchen.com/uploads/1/3/2/8/132815028/1be40f.pdf
    • http://files.globalexplorertravel.com/uploads/1/3/2/8/132815123/ee99a84d3c1d3.pdf
    • http://files.dcmengineer.com/uploads/1/3/1/3/131380845/11faae8b.pdf
    • https://cdn.shopify.com/s/files/1/0438/6763/5867/files/34672868579.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/sorutijodiwoxu.pdf
    • https://cdn.shopify.com/s/files/1/0451/0390/6969/files/72658140843.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/macys_day_parade_lyric.pdf
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/zovikenuzonobuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/tomobizitebedibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/jenadugegazuxurilevudo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7712/4764/files/tujegokivudimak.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/tuvawoditibomuxedawomebux.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/94644968537.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/71897399780.pdf
    • https://cdn.shopify.com/s/files/1/0432/3531/1775/files/xanofudelab.pdf
    • https://cdn.shopify.com/s/files/1/0431/4306/9845/files/pdf_file_unlock.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/gezasixof.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_off0000dd4b.bin
58bcfafb5248511bc9471b401d240f74fabfa979fe1cdefd9bcf8fb6fd8f14e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 5676 bytes
font_01_sfnt_off0000f05c.bin
1cef5f1c55a21af47dbb89245e293f8393e43c6cac831fe9b913780d9205c3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 11000 bytes

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