Malicious PDF — malware analysis report

Static analysis result for SHA-256 77712e22ad38a2ab…

MALICIOUS

PDF

68.5 KB Created: 2020-07-30 04:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23bb725cc14a318cc905ee9bc1ddd853 SHA-1: 8ffec9b5b7b5e4114ab27d00247dbd3edbd0081f SHA-256: 77712e22ad38a2ab17b6447baf29cdb3543aeaefb9682cf40920bfb42275a487
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to medicinal uses, aligning with the 'SE_INVOICE_LURE' heuristic. The presence of embedded links and the ML classifier's high confidence indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/pify?keyword=calotropis+procera+medicinal+uses+pdf
    • http://files.stowemusic.com/uploads/1/3/1/6/131606368/xuvefiwuxojiwel-tenadamup-sewiz.pdf
    • http://files.adamwilliamchalmers.com/uploads/1/3/1/4/131453645/zerodukegokide_zisif_xibusuroxolalov.pdf
    • http://files.orderbaileys.com/uploads/1/3/0/7/130775049/linusapoxasozo.pdf
    • http://files.genius-usa.com/uploads/1/3/1/3/131381804/poviwumifabawuj_jotojigef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/4365/1735/files/lezumukapekuvonelefabibap.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/puzegupofo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/jurotozotokuge.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8369/files/45036641895.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/telowowewimuwodibilukuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/xetomozorowibufa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/fesajuvunojiba.pdf
    • https://cdn.shopify.com/s/files/1/0437/0546/7035/files/zulisemaxo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1404/3294/files/55532388027.pdf
    • https://cdn.shopify.com/s/files/1/0436/0136/3107/files/38868248577.pdf
    • https://cdn.shopify.com/s/files/1/0437/4649/2565/files/dofiwewopimuzalisu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009ec1.bin
2429c8c7fb08f4f0aa9dda251f0efab930169399c44e2321464ae557befc234a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC1 5208 bytes
font_01_sfnt_off0000b059.bin
e18682b3fd46480e9666d503c4d562864582807b4e0cbc1ca2988c903de9febe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB059 2320 bytes
font_02_sfnt_off0000baaa.bin
aa459b34ac48199d0e597c298bb3ec09ce7835d97125c6ee73dc1b766d229c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAA 9888 bytes
font_03_sfnt_off0000dcb1.bin
c3f93d69e3cb30c81ae8f35965ac9f1a1a35941069675b7c0fcc3f03c8d11774		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 16224 bytes
font_04_sfnt_off0000f237.bin
ce21af678a59f1ce5e03fd293ee088f7ed2bbda597d81d267a3c4da1d2815424		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 4488 bytes

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