Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfd332f4a94f997…

MALICIOUS

PDF

55.4 KB Created: 2020-08-06 19:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b250702fe798ba31e0189ad081990a02 SHA-1: 6303a04b475b32fe8dd09b996e21ef9f428b2e7a SHA-256: 5cfd332f4a94f99782a66641b44554980a7094881d7380506fc91cc51e5e2722
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector, suggesting the primary purpose is to lead users to malicious infrastructure.

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.cc/pify?keyword=fci+assistant+grade+3+advertisement+pdf
    • http://files.cymru.tycymorth.org.uk/uploads/1/3/0/7/130775080/kapijibedimisojefuk.pdf
    • http://gatil.henhouseart.co.uk/uploads/1/3/0/9/130969045/8720791.pdf
    • http://files.maria-cipriano.com/uploads/1/3/2/6/132683000/samowu.pdf
    • http://files.callanjames.co.nz/uploads/1/3/1/3/131398000/ranurupowalos.pdf
    • http://files.septicserviceshunstville.com/uploads/1/3/2/6/132682655/duvizukujalufon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/vagupiwar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdf
    • https://cdn.shopify.com/s/files/1/0432/1814/1347/files/40715070878.pdf
    • https://cdn.shopify.com/s/files/1/0436/9612/8153/files/15814471308.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/8408024913.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/zamobefavatofep.pdf
    • https://cdn.shopify.com/s/files/1/0434/6881/6544/files/django_array_field.pdf
    • https://cdn.shopify.com/s/files/1/0437/4413/3281/files/36170969254.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/95338504120.pdf
    • https://cdn.shopify.com/s/files/1/0434/4571/5109/files/lusevarasututuvelise.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/bowflex_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0437/9066/3832/files/85570783884.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006729.bin
ba37bc3d076a96ca9de3fa42526e8005938a1e9fd5c596f969d79ad17fd346da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6729 5620 bytes
font_01_sfnt_off00007a3a.bin
ba3d498fb0265f06a5e059d6578b2446085df1d7fc6bf2db694160321929a8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3A 5684 bytes
font_02_sfnt_off000089dc.bin
d2608dc11ac8086760e283e9c79d3148251d362786438c911dc05ccfea8f4000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89DC 14788 bytes
font_03_sfnt_off0000b7f4.bin
85a233df2680af02f43e683b55ab6dfc19001444a59be515fc53efc100138496		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F4 16728 bytes

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