Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6b9c646094a9c0…

MALICIOUS

PDF

83.9 KB Created: 2020-08-02 07:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb74fcb92a61e6d2b4aef897d138b3ad SHA-1: 8fbfbc854c7bc366174760fb14cfce8a5f2e1a17 SHA-256: 4c6b9c646094a9c0e916889b817f8f2e9d7cd668fd4592bb6c2ff23ddc7d7d1e
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, contains text suggesting it is a lure for a 'Disney annual report 2015 pdf'. The presence of numerous Shopify-hosted PDF links further indicates a link farm or content distribution network used for hosting malicious documents. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=disney+annual+report+2015+pdf
    • http://files.milwaukeemikeandthemob.com/uploads/1/3/1/1/131164386/nanotujorag.pdf
    • http://files.wakefieldstudentsupport.com/uploads/1/3/1/8/131856285/13ab3.pdf
    • http://files.nabasco.net/uploads/1/3/1/4/131437859/wemoli.pdf
    • http://files.lqqkerinsider.com/uploads/1/3/1/0/131070207/lasufujufetumiso.pdf
    • http://files.misshanson.com/uploads/1/3/2/7/132740296/subute.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7250/files/16736979594.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/67404511878.pdf
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/fegikinapivebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3380/files/sonyvegas_pro_8._0.pdf
    • https://cdn.shopify.com/s/files/1/0434/9689/8724/files/bigowimemakebiko.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/93686222111.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/30904108446.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/dosafakixudidejig.pdf
    • https://cdn.shopify.com/s/files/1/0428/8570/9987/files/luvenedebatijobodus.pdf
    • https://cdn.shopify.com/s/files/1/0438/9486/6088/files/lukewotaruno.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/fomatunudexafano.pdf
    • https://cdn.shopify.com/s/files/1/0431/0525/5577/files/95569060294.pdf
    • https://cdn.shopify.com/s/files/1/0437/8358/5953/files/xadumupudu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f162.bin
26d94796bc71f457332a6164785ec6409ff477e9f9302fdaf50d1374d3754d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 5468 bytes
font_01_sfnt_off00010415.bin
9740c82825f1f2e001e97ed2fa8bf683b31bb48c11823e14339da2b23d659fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 15424 bytes
font_02_sfnt_off000133d5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 4324 bytes

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