Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d271b47bbb9a3f…

MALICIOUS

PDF

31.4 KB Created: 2020-06-17 04:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1e4b62ecde9848514068f7d8c9897ea SHA-1: 8a970accb758d67c650121d0e86d2d930c47298b SHA-256: c7d271b47bbb9a3f3f31127bd4eba174f58a5527ff0616591354c0f7acc6ac70
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm or redirection scheme. The primary purpose appears to be directing users to a multitude of external PDF documents hosted across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://c3.undesirable.us/uploads/1/3/1/8/131871484/131871484.html#tiles+catalogue+pdf
    • http://properplace.info/uploads/1/3/1/3/131398219/1322873.pdf
    • http://expandwellbeing.com/uploads/1/3/1/4/131438330/369df88.pdf
    • http://mta-sts.mail.prettynpoised.com/uploads/1/3/0/5/130539759/jokopolefewoveg-xibiroti-tudevoxa.pdf
    • http://74-123-76-101.mgwnet.com/uploads/1/3/0/5/130545557/xurimojugojuje_romarevuvi_vuzisupiregadi_xakitorifotal.pdf
    • http://hostmaster.peacebeyondsuffering.org/uploads/1/3/2/3/132303315/nukokamopepagugov.pdf
    • http://mariakouznetsova.com/uploads/1/3/1/4/131482808/7936255.pdf
    • http://createandvibe.net/uploads/1/3/0/6/130620573/854929.pdf
    • http://apexgpi.com/uploads/1/3/2/6/132681886/7267801.pdf
    • http://claytoncollierbrown.com/uploads/1/3/0/7/130776260/zavobojubopa.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_off000044e2.bin
4b9a80a77e8cc83f3bf923670fa4dc9b8dd31dc89727106d68bcc3dbf421f1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44E2 4952 bytes
font_01_sfnt_off000055c8.bin
71bb38ce2eb62ef8ed6893a384c5f98a5c57f63f8618de2af82a40f09811acc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C8 8244 bytes

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