Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c3632fbee77616…

MALICIOUS

PDF

33.1 KB Created: 2020-08-14 12:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b93956dd1551843833ded04342fe2eec SHA-1: 8fe7bcbff2d1aed81738c65adc3a27431a6eb438 SHA-256: d3c3632fbee7761681bc54704af232476ad7a1fc7a048a863f68ff37b09551d2
150 Risk Score

Malware Insights

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

The PDF document contains a link farm and a direct link to a known malicious redirector, disguised as a "Nevada medicaid eligibility manual". The ML classifier strongly flagged this PDF as malicious. The document body itself is heavily obfuscated but contains the target URL, suggesting the primary purpose is to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/wb?keyword=nevada%20medicaid%20eligibility%20manual
    • http://files.genesyscatering.com/uploads/1/3/2/7/132740435/manewalulov_depinifabebeku_sunew_sikikizagad.pdf
    • http://domapet.gardenincubator.org/uploads/1/3/1/4/131407148/6349234.pdf
    • http://files.tongluaytch.com/uploads/1/3/0/7/130775215/timoxapewede.pdf
    • http://files.keyboardmelodiesforseniors.com/uploads/1/3/1/4/131453022/c4289.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/4_digit_subtraction_with_borrowing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/vevadexafomola.pdf
    • https://cdn.shopify.com/s/files/1/0430/9113/2567/files/95487558782.pdf
    • https://cdn.shopify.com/s/files/1/0430/7081/6407/files/mekadibedetutamafano.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/xofodudabumekiturisituraw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/47146768215.pdf
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/paziwanoxobujawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/antropologia_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0429/0831/9903/files/yield_management_strategies_for_the_service_industries.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3057/files/26234385019.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/53962599064.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/90435798869.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wogol.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/bajog.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_off0000462c.bin
f362053c6a9e97425967b5d56964ff1312dd790d5422f7c6656eed61fc71b1bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x462C 5256 bytes
font_01_sfnt_off0000580a.bin
a9cbfb495a830312fec8066d55dc224542004e98f83cd9d62963042c99e7d76c
pdf-font-stream PDF embedded font (sfnt) at offset 0x580A 9192 bytes