Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1a115572679148…

MALICIOUS

PDF

45.8 KB Created: 2020-07-08 15:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65004e060a76de0a524cd78eebb941d5 SHA-1: bb6e141e4e4cc3fdd647de6fd527859c100d8ada SHA-256: 5b1a115572679148b1ed93fb5b0f7d351e491b1d4296cbb98391fb25859f99ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One prominent URL, 'https://ttraff.com/wb?keyword=school%20violence%20in%20south%20africa%202018%20pdf', is identified as a malicious redirector. The sheer volume of links suggests a link farm or SEO manipulation tactic to distribute malicious content or phish users. No scripts were extracted from this sample.

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.com/wb?keyword=school%20violence%20in%20south%20africa%202018%20pdf
    • http://files.dj-dogtraining.co.uk/uploads/1/3/0/7/130739744/1083822.pdf
    • http://files.worldofhello.org/uploads/1/3/0/7/130738501/xefexexujazi.pdf
    • http://files.valleyliberator.com/uploads/1/3/1/6/131606035/padavosagog.pdf
    • http://files.paramountrec.com/uploads/1/3/0/7/130775827/wanuvawofi.pdf
    • http://files.slamadelong.com/uploads/1/3/1/1/131164394/8fe59976.pdf
    • http://files.edgingtonroaddistrict.org/uploads/1/3/1/1/131163932/difomaza_dubovunen_xalexujoxefop.pdf
    • http://files.muddyriverhomestead.com/uploads/1/3/1/3/131379395/pavuvedoje.pdf
    • http://files.riccijustisart.com/uploads/1/3/2/6/132696280/tanepuwimoxe-fofan-nufema-nuxebusazokolez.pdf
    • http://files.dkdynamite1.com/uploads/1/3/1/4/131407263/kojizim.pdf
    • http://files.firstathens.org/uploads/1/3/2/7/132710687/9347935.pdf
    • http://files.rivermenrodandgunclub.com/uploads/1/3/2/3/132302973/nomegariwutok-wibiwu-visinatixubuj-sojimuta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://popitaje243513875.files.wordpress.com/2020/06/disufelosopapeganegamovo.pdf
    • https://zuxefeja.files.wordpress.com/2020/06/gazugefipugepugisenu.pdf
    • https://wedumokub.files.wordpress.com/2020/07/11094008656.pdf
    • https://resofev.files.wordpress.com/2020/06/50501158350.pdf
    • https://voxofuv.files.wordpress.com/2020/07/7069273214.pdf
    • https://wokixigerod.files.wordpress.com/2020/07/falozajopon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000746a.bin
90c32cfe95c7c1b5dcc461bce872e7b50da6218f4f7507848348549eaba79a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x746A 5808 bytes
font_01_sfnt_off0000881f.bin
f317829352c6c60bcb2a37ae70b428d338a886c8f2a5561c06db27a628ea85d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881F 9956 bytes

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