Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d821401e9b47b0…

MALICIOUS

PDF

39.7 KB Created: 2020-08-30 04:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee59b40a5fd0e517e1dce8e60c888ed3 SHA-1: 4112e8b7257d27d3b175d295e1f3febd796654d4 SHA-256: 22d821401e9b47b0643166cd8aef246ee3d4a80f5707625f6be6eeb27b98b0ec
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate academic resources, but the primary link redirects to a malicious URL. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's a lure to a redirector. No scripts were extracted, limiting the analysis of further stages.

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.cc/wix?keyword=managerial+accounting+15th+edition+s
    • https://cdn.shopify.com/s/files/1/0437/6641/5514/files/tugogitaduwotisaxuvuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/what_is_an_example_of_sophistry.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/agile_software_development_with_scrum_ken_schwaber_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/3495/0304/files/riteropeguxufajazebaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/65228633804.pdf
    • https://static.usrfiles.com/ugd/b8c837_53b723ca448249d7b193bc810be51e90.pdf
    • https://static.usrfiles.com/ugd/f84671_81d0bbe40cda4cdaa25e0d58bc59aa99.pdf
    • https://static.usrfiles.com/ugd/2ac701_e13d68cbe4eb4aa9be9358b82f53853a.pdf
    • https://static.usrfiles.com/ugd/b8c837_88b9ef4220b64299b85ebb8981df6e3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd358dfc61e540668b4d35995bce5230.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c14416a733149fc89429cb3b7202c02.pdf
    • https://static.usrfiles.com/ugd/b8c837_03469f8f1a1c4133900d943862dac300.pdf
    • https://static.usrfiles.com/ugd/f09a9d_4dac738537e94dd0a0a10151c0ca7431.pdf
    • https://static.usrfiles.com/ugd/b8c837_b62c544c6b27459db7f4b7e1f6e53453.pdf
    • https://static.usrfiles.com/ugd/2b25b5_b5d0bc398a9549cfa07ea3e2b2c4e8c4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f3c.bin
e4c94d2dfb17cfbd73ab00aefd82da3ee1c3de50d3028f8926188413fe72be55
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F3C 5264 bytes
font_01_sfnt_off00006116.bin
76bdc9e3ddc5ee204bf2c9f16138a4b24cb9915a3c98dacd42c9c2f075f83974
pdf-font-stream PDF embedded font (sfnt) at offset 0x6116 10256 bytes
font_02_sfnt_off000083e1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x83E1 4324 bytes