Malicious PDF — malware analysis report

Static analysis result for SHA-256 04dae72daf2a1f8b…

MALICIOUS

PDF

49.3 KB Created: 2020-08-31 04:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 208f34e8505202b933b86e80b260a44a SHA-1: 8e0b99c7d619396b8675fb73384116f2920910e3 SHA-256: 04dae72daf2a1f8b677f0dc1c9c43ec16197fce897902c5cb30710debd2aa312
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one primary link identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'motivation letter for a scholarship', likely a lure to encourage clicks on the malicious URL. The ML classifier strongly indicates maliciousness.

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=motivation+letter+for+a+scholarship
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/97aff7_607039bcf4784caa812e345669671a4f.pdf
    • https://static.usrfiles.com/ugd/451461_3d475cae9f6c4288952f5f4c23fbe19a.pdf
    • https://static.usrfiles.com/ugd/98e298_639cb13d06c24911b3a7f2e68b23efc3.pdf
    • https://static.usrfiles.com/ugd/1cc777_39b0b16bb8f443678b730179565414ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa3f1faec73e480c94bc9a41c8222df8.pdf
    • https://cdn.shopify.com/s/files/1/0432/9370/4350/files/jaminakegajem.pdf
    • https://cdn.shopify.com/s/files/1/0459/7006/3520/files/tsc_te_244_barcode_printer_driver.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/40018897092.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8482/files/begebiloronozusefiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/analytical_chemistry_basics.pdf
    • https://static.usrfiles.com/ugd/fd3290_b86e18ef72e142d1b83c747e877d0816.pdf
    • https://static.usrfiles.com/ugd/9a242c_e226098dd14a4f0ba4c38e4420d14619.pdf
    • https://static.usrfiles.com/ugd/3cb679_159dc835dd954a21a84aacf3bac74189.pdf
    • https://static.usrfiles.com/ugd/eed56f_534ad69850254595ab63382871c17142.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006751.bin
016465072de796528403cb16f2a02ef0e327a2db92296a8d61ae925a619d7e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6751 5168 bytes
font_01_sfnt_off000078ee.bin
4147d5bd38a6991ed97088fd72c4ac766fa4cfb93d4c14ae6c912e85995b9872		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 10684 bytes
font_02_sfnt_off00009da5.bin
e0e598f52b69295c6d4910291b5d3c4c23a9adc97df0965359e6fa3d8bd1be89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA5 17752 bytes

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