Malicious PDF — malware analysis report

Static analysis result for SHA-256 621240f0adb0963b…

MALICIOUS

PDF

56.5 KB Created: 2020-08-31 05:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eccf383a9001d77f47006b76d0d87852 SHA-1: 21cdc639867b2190de862ccf6e4f2cc6a6ca92b5 SHA-256: 621240f0adb0963b1f65b3ec25905f840248964144836b23eb3453f38d09fb02
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, which is part of an advance-fee scam lure. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a link farm used to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=daniel+liang+introduction+to+java+pr
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/89064d_a43f615631de4773ab76d7e3fcce4fa0.pdf
    • https://static.usrfiles.com/ugd/aef5b7_633f7629f1fa4a2b84744ae46ccd0e02.pdf
    • https://static.usrfiles.com/ugd/8b49c6_c51d4f4d04724390a48c64e23e37f4a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_94fecb2c620b4413a075832d1129f03d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d787bbd8e0d44fdb1837c1c99718a4e.pdf
    • https://static.usrfiles.com/ugd/ad2ade_1677b310b68d4b4bb165c2bc8a7b8d86.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_9177cded59654f14add2f5df7cea3e71.pdf
    • https://static.usrfiles.com/ugd/a467d2_912d8ea95d924ca9a2e1a068b205fe88.pdf
    • https://static.usrfiles.com/ugd/de3d83_e7ba2eb41106445ca93b0ad135939d9e.pdf
    • https://static.usrfiles.com/ugd/64f9d2_886b2271951a4e5092019cd686fb727f.pdf
    • https://static.usrfiles.com/ugd/599026_79b793ad79014c11a5f682aff40aaef2.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4ad0c5470d84547a3b459b64627caf4.pdf
    • https://static.usrfiles.com/ugd/8de238_e4c1b6d7f8394a8cac9e4752b1609944.pdf
    • https://static.usrfiles.com/ugd/739437_07ce20d15da3447590beea721a895169.pdf
    • https://static.usrfiles.com/ugd/b8c837_693ee6fde0234f50981d66cb7a8eb40f.pdf
    • https://static.usrfiles.com/ugd/34ec99_f61a9677730c4aefb0605a23ea73925c.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_off0000930b.bin
cd23e31482d1ae22430af0b8bef88dcaad252994c84befb03895f703d21ef646		 pdf-font-stream PDF embedded font (sfnt) at offset 0x930B 5196 bytes
font_01_sfnt_off0000a4d1.bin
244cba4fcfb63b36d46da866de138a978b9ceb7360824c884561ce5c0c31952e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4D1 15796 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.