Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6de673f8769bfe9…

MALICIOUS

PDF

34.1 KB Created: 2020-05-15 05:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7c3d0ef8063097b49efd61e036e414f SHA-1: acf08307189d316b54320971856b7482f23a3473 SHA-256: a6de673f8769bfe907c55d25e9ee8ea09a87784faa20108462567e52f40c2428
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDFs hosted on similar domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains text related to a 'Garden leave letter template hong kong' and includes the same URLs found in the heuristics. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click on these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://sterlingseniorliving.net/uploads/1/3/1/3/131379874/131379874.html#garden+leave+letter+template+hong+kong
    • http://skyviewneweducators.info/uploads/1/3/0/6/130621095/2569227.pdf
    • http://mahavidyas.com/uploads/1/3/0/7/130739312/1d9545f94275.pdf
    • http://thenoblemanor.com/uploads/1/3/1/4/131437982/5932302.pdf
    • http://gsbfconvention.org/uploads/1/3/0/6/130640141/pibutuvevipega.pdf
    • http://johnyoungconstructioninc.com/uploads/1/3/0/5/130588206/nojosak_vugejiretaxeti_dirikat.pdf
    • http://franklinfallsnh.org/uploads/1/3/0/5/130539446/telolotem.pdf
    • http://laurenfortunato.com/uploads/1/3/0/4/130483767/8915374.pdf
    • http://shinelocalmarketing.com/uploads/1/3/0/2/130270747/1269b.pdf
    • http://melissagatsonevents.com/uploads/1/3/0/2/130273896/mikodoku-butoxe.pdf
    • http://americanteachersacademy.com/uploads/1/3/1/8/131856937/gadew.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a3a.bin
2936103255a88fa69cf541731061ca03a6ccf129e1ef16cd1acfd1631fcdd378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3A 10192 bytes

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