Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd5a5139acc6f76…

MALICIOUS

PDF

35.4 KB Created: 2020-08-04 17:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa79c2a945cd99f7c09f833778a935f7 SHA-1: 3da7b773f961061815b239d5e0b1d0a6b414805b SHA-256: ebd5a5139acc6f76777f3048ffb5654cc9acd62522c4fbddfe8b78423f3697c2
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to 'career paths medical book pdf' and includes the malicious URL. The PDF_SEO_LINK_FARM heuristic further suggests a large number of outbound links, many of which point to potentially malicious or suspicious domains. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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=career+paths+medical+book+pdf
    • http://vimixuzuw.bonniemeguid.com/uploads/1/3/1/6/131636664/nepiwufa.pdf
    • http://files.thebatesoutfit.com/uploads/1/3/1/6/131606186/rifet.pdf
    • http://files.bysamanthajo.net/uploads/1/3/0/7/130740212/xujijaxox.pdf
    • http://files.ultrafitpersonaltrainingstudio.com/uploads/1/3/0/7/130738919/3852185.pdf
    • https://cdn.shopify.com/s/files/1/0437/6372/8545/files/71860724869.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71895705060.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/85225190353.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/xapito.pdf
    • https://cdn.shopify.com/s/files/1/0436/7309/2246/files/20393176911.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/fogujuxizaga.pdf
    • https://cdn.shopify.com/s/files/1/0437/1513/3605/files/sowakegovozosaduwuselexat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/bugazeketoxomulafadunusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/59538643681.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2629/files/668385041.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/10927255673.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/likivibidunijupoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/venefixob.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_off00004a90.bin
2dd2bbb2c21c1a6f0499a6357d04578301019349d9c5d7c9d188cd57da53d065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A90 5504 bytes
font_01_sfnt_off00005d18.bin
74682dc41ebc4daba24fdf2ba28e90cf4ee5e1b2d9663515410ed9ad2a6b7751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D18 10172 bytes

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