Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c629940fc441ba…

MALICIOUS

PDF

46.3 KB Created: 2020-03-24 17:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 10657b9f7b71f0ff74eb20e55e50cfff SHA-1: 9ec5953e55e2d45c331a9393a7d4bdad98845857 SHA-256: c9c629940fc441ba9d65538866ae629346a0fa760ebf6166066a18ae5cf3c845
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to a 'dark souls 3 pdf guide', which is likely a pretext to drive traffic to the linked URLs. The ML classifier strongly indicated maliciousness, supporting the interpretation of this PDF as a distribution vector.

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://ww2tv.net/uploads/1/3/0/5/130589286/130589286.html#guia+oficial+dark+souls+3+pdf+mega
    • http://friendlycaretransportation.com/uploads/1/3/0/6/130639653/gevajid.pdf
    • http://sachingolf.com/uploads/1/3/0/4/130483781/1465ae9bce68d.pdf
    • http://www.kotchera.com/uploads/1/3/0/5/130543766/8751593.pdf
    • http://erichgeospatial.com/uploads/1/3/0/2/130289333/6059cfab0ef82f7.pdf
    • http://vote-for-our-schools.com/uploads/1/3/0/4/130478704/mubiril_redomapakesi.pdf
    • http://learning-sciences.com/uploads/1/3/0/2/130289765/kuzorawururuwolosaj.pdf
    • http://caboolturespeechpathology.com.au/uploads/1/3/0/5/130542968/954704.pdf
    • http://www.irvingstreetprints.com/uploads/1/3/0/2/130270892/3881c46e6aa08.pdf
    • http://simpleups.com/uploads/1/3/0/5/130589373/vesadeda.pdf
    • http://goldcoastfootballacademy.com/uploads/1/3/0/4/130476910/vibur_kugaduxekobeneb_momaturaz.pdf
    • http://shadowlights.cafe/uploads/1/3/0/6/130639360/2ce8ca3.pdf
    • http://conteudo.emausfloripa.com/uploads/1/3/0/2/130287842/158429.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006959.bin
5451d153a5d28b65b2cb4ca26864039bb7703a9f65e26ed4c94ea7cd6326305f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6959 9788 bytes
font_01_sfnt_off00008ce1.bin
bf9b9d10e9d9890ab9d1a7ec18efb3f3b6daf3583292778e90f0943f39e87841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE1 2600 bytes
font_02_sfnt_off00009608.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9608 16036 bytes

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