Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea398928da6f0d1…

MALICIOUS

PDF

39.0 KB Created: 2020-08-29 14:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a72f569cebb6297dd7c42e343c8bddb7 SHA-1: 01d91ba94dfd33399fcb81009b10b069496ec0c0 SHA-256: 9ea398928da6f0d1295417802ffeb9a7a62007a6c94ab93424d49b8bc99272a9
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a book title and the authoring application, suggesting a lure. The presence of a malicious redirector indicates an attempt to lead the user to a harmful destination, likely for further exploitation or credential harvesting.

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.ru/wix?keyword=intro+to+language+fromkin+10th+edition
    • https://static.usrfiles.com/ugd/b8c837_3f497ba781d34cb5a5cacf40d1b91d67.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b97337ce6814cd8830409d92ae1f946.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfc587d6c35a4f17877ed0369fc95c21.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_3262efc2177d4758b1fc120a4a0e2bdb.pdf
    • https://static.usrfiles.com/ugd/b8c837_033bed34c16348498c0422b5935de5ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad8ec77c1d674a20b193146279898101.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e3700100bf8468690f178499c8e90fc.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_f16d042f206c4296b032bee3d2275005.pdf
    • https://static.usrfiles.com/ugd/b8c837_09700cbd270b469b85e10c2db4c465d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_60e58ff5224a480da5784657af1b4e42.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8136/files/fiber_optic_communications_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3093/files/xalabopikeravamologavifeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/tefobumufatijanijutul.pdf
    • https://cdn.shopify.com/s/files/1/0430/6586/8437/files/99409671924.pdf
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/91270746406.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_off00005a00.bin
60f37021eb79601f4549c2fc44404f89a95bc353aeef915400a4d935822fd0b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A00 5336 bytes
font_01_sfnt_off00006bfb.bin
c7ed831e6be8bd71a78539705b07ce4cf80901bea9e1910638454f37a1e602ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFB 10356 bytes

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