Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dde14240ea0e90b…

MALICIOUS

PDF

45.2 KB Created: 2020-08-29 22:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1f5425e4f418f0e0b14641ddf0c11c4 SHA-1: 2721d856a0769b136a703d2d8af96fd5240afda0 SHA-256: 5dde14240ea0e90b7736e380e283f0df0dfa076f5cbab112eccab97b3a3825f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 related to a book title and a URL that appears to be part of a link farm. The ML classifier strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent.

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=clinical+problem+solving+in+dentistry+edward+w.odell+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0075/7398/files/tenima.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/41066457864.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2046/files/alif_episode_11_12_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bde45607d7d45798d5c14c2ef08990e.pdf
    • https://static.usrfiles.com/ugd/b8c837_43e3d64818224ac5b1e3f2e38b3bbd34.pdf
    • https://static.usrfiles.com/ugd/ab059d_878df7be23f04bf3b52b86fd02b13f3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1650010c74a4b21bfcd43e6d698b70b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dac6d33d23745beac1c2bc26ccdf979.pdf
    • https://static.usrfiles.com/ugd/b8c837_349c252372984fe9b3410c02ef022d81.pdf
    • https://static.usrfiles.com/ugd/b8c837_c184b7455a034f538d3f49b9791a0744.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe32f41167d64790aa6cbf2f5ab06d77.pdf
    • https://static.usrfiles.com/ugd/d94ae5_3b2845eb0399459289161ac99192ff0a.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_0278e2a13caa47a99f5e1b6c73b374c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_49773783d9b1483f950c79338b3366ba.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_off00007030.bin
512202984801b786cc0419c2480bdc4ba16fe3b939d065afc647691ba429342e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7030 5808 bytes
font_01_sfnt_off000083e7.bin
1a68d34c83362c6a7863a58d92183c1bee3864c2aa650541ce04ab6622519f2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x83E7 10308 bytes