Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8fcb6bf3e57e7b…

MALICIOUS

PDF

47.8 KB Created: 2020-08-12 01:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81d91c8d36cbeaf90fd897e2bcfeca4 SHA-1: d5b21100c184fc9574bfcaea3f19ea43fce2edff SHA-256: 2e8fcb6bf3e57e7b773a9b0a4d2b3bc92d8af77738ee8b1d3bc16cfa57ce315b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=assembly+language+step+by+step+3rd+edition+pdf', is designed to redirect users to malicious content. The PDF also exhibits characteristics of an SEO link farm, with numerous embedded links, suggesting an attempt to manipulate search engine rankings or distribute malicious content through seemingly legitimate-looking documents. The ML classifier strongly supports the malicious verdict.

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=assembly+language+step+by+step+3rd+edition+pdf
    • http://naseki.heatherbiggsphotography.com/uploads/1/3/1/3/131379730/rizezijixesi.pdf
    • http://files.shenandoahvabusiness.com/uploads/1/3/1/6/131637043/0c5ae020.pdf
    • http://gikolosug.thehandsprogram.org/uploads/1/3/1/8/131856919/vajov.pdf
    • http://doxovagib.ridgelychristianchurch.org/uploads/1/3/1/4/131482952/mojidusonenufemad.pdf
    • https://cdn.shopify.com/s/files/1/0436/5074/4478/files/januzigetulenudakizoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/23717475442.pdf
    • https://cdn.shopify.com/s/files/1/0435/8730/5629/files/66653770436.pdf
    • https://cdn.shopify.com/s/files/1/0432/6329/5654/files/collective_noun_examples.pdf
    • https://cdn.shopify.com/s/files/1/0447/8559/8615/files/zero_coupon_bond_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/3157/6231/files/manual_sql_server_management_studio_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/74457104214.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/31571807010.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/wekofujita.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/memovasifob.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/xikupuvokidakolaniwapuba.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/public_static_void_main_string_args.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_off000079d0.bin
c897a0955dc80990ef1aa4af99713b3e7838548d0c302e724aa9d3e159fd5761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D0 5756 bytes
font_01_sfnt_off00008d56.bin
a14a83d60f6b1c071460974c922a652319f95d78b441a27eb90a21222806635a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D56 10648 bytes

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