Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f36981bb5d1885…

MALICIOUS

PDF

44.5 KB Created: 2020-09-08 18:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: effdb8fd88ee7ef89e9df0edce3d1bc0 SHA-1: 2049197535362aac6b546361878c3d1af4e165e5 SHA-256: c9f36981bb5d188529174e102dd3623f22f5644587bb1990639a794e9b6af722
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body and embedded links suggest a lure to academic or financial content, likely to deceive users into visiting malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/wix?keyword=20+types+of+amino+acids+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/20619888679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6778/2821/files/bank_account_statement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0358/3384/files/64371721332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/8625/0914/files/princeton_java_cheat_sheet.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ee6100_80c90ba38b8741fea80c5a746090217f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d48fe3_5f08c5740d4d4a968aa6475b641afc3d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_042db4c71278417f95a5e63d6f565598.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8a05ec_0509654354bc4e01a22abd7452c6cf84.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bdeb4c_6abcebeaf3a242afb460ff5c7dfafc84.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ea5d7b_ffd6de252ddf4cf5873e2b0750b4e32b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/565485_0cfb9c2d422f401da6ddbdf6c4040f1c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_42c352870c6d464aa2ba5c4fa26692ff.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c3f59f_8a83253caba94d45943eeb848e043a20.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c3f59f_81998587d51d4114b40a9aaad05c5b70.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6684 5452 bytes
SHA-256: 637dd72c6c10ced6ac5f8d753c0aa39554e67e3495e81efdb642e58d8003efba
font_01_sfnt_off0000790c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x790C 14380 bytes
SHA-256: 63de50df346d0a4852772cbd8bcc984bae00b39787714fa8101a27dce49b4ddf

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