Malicious PDF — malware analysis report

Static analysis result for SHA-256 778877ef98b968c5…

MALICIOUS

PDF

34.2 KB Created: 2020-06-05 07:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a534c56d46dc82243f46be371b8fd7fc SHA-1: 1d27e05a3ea9b21acff494a2942193b7d93ecb12 SHA-256: 778877ef98b968c5ddf8de19866f1327410b03a858a0cd5db88cec580b69fc8a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports this assessment. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to potentially harmful external sites.

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://mictlan.shop/uploads/1/3/0/7/130739280/130739280.html#empire+warriors+td+hero+rune+guide
    • http://solopaso.org/uploads/1/3/0/9/130969062/segomoguwogut_sujenijunogad_lumebuxev.pdf
    • http://treasurecoastprimeproperties.com/uploads/1/3/0/4/130488252/088a1b3783b8ae7.pdf
    • http://danwalshforjudge.com/uploads/1/3/1/6/131637302/nisovigozu-mamap.pdf
    • http://cblaseredgifts.com/uploads/1/3/0/3/130312972/5f158c194e.pdf
    • http://kidoland.net/uploads/1/3/1/6/131606169/joxurotulowe-pimuriwiwasa-xumuxobiladif.pdf
    • http://commercialcleaninggrandeprairie.com/uploads/1/3/0/6/130639953/malunatugatesi.pdf
    • http://hostmaster.graftonchildcare.co.uk/uploads/1/3/0/5/130542769/2288300.pdf
    • http://mictlan.shop/uploads/1/3/0/7/130739280/terms.html
    • http://mictlan.shop/uploads/1/3/0/7/130739280/dmca.html
    • http://mictlan.shop/uploads/1/3/0/7/130739280/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pigumofow.files.wordpress.com/2020/06/89107033744.pdf
    • https://kiligirili.files.wordpress.com/2020/06/xepevifogunidiwalefadetak.pdf
    • https://risisizokude.files.wordpress.com/2020/06/modovemaloxu.pdf
    • https://suxeniruwip.files.wordpress.com/2020/06/gepasekusikeporomexud.pdf
    • https://jebemoma.files.wordpress.com/2020/06/11729843861.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000594c.bin
fd99ee03fb50757f77f373860a6451881634e25ae723d5c1778821a3700bf7df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594C 10604 bytes

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