Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9ec9e1c97ccb09…

MALICIOUS

PDF

50.4 KB Authoring application: PDF Studio
MD5: 28e13967cd275a6985fd6ec6f6e02c73 SHA-1: d810588b97eaef9b665a0a893d9eb9c27c7c8566 SHA-256: 9c9ec9e1c97ccb0981a58271554c24e420e17a2e61421bdffb5f6800be17bb95
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body mentions 'OSRS' and 'clue scroll', suggesting a lure to attract players of the game to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://nuevalinea.es/uploads/1/3/0/6/130639084/lozalirup.pdf
    • http://cectcapecod.com/uploads/1/3/0/4/130476344/zelavironedaxeb_vilor_pavore_koxefovedonugu.pdf
    • http://mirasolrehab.net/uploads/1/3/0/6/130620290/be1a12d409.pdf
    • http://reviteskincare.com/uploads/1/3/0/2/130292148/nobizotofebe_vubewaleb_gajiviso.pdf
    • http://kcbbc.org/uploads/1/3/0/2/130289436/946427.pdf
    • https://nazufobaxorad.weebly.com/uploads/1/3/0/6/130604682/wevidawef.pdf
    • http://doublettango.com/uploads/1/3/0/2/130287289/dde15b54f7e3.pdf
    • http://guwuju.theodoro.ru/uploads/2020/01/28/sojusugapafuv.pdf
    • http://mengyaoyuan.com/uploads/1/3/0/2/130289550/neziwunenisivedofob.pdf
    • http://brundlethwaite.com/uploads/1/3/0/6/130604065/kelawodemag-ratef.pdf
    • http://petervinthagen.com/uploads/1/3/0/6/130621298/130621298.html#osrs+buried+beneath+the+ground

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000128e.bin
c54359aa418970f98540f86b44dcb6eeeb5e30a2002592097cad763e1b415b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E 8104 bytes
font_01_sfnt_off00007f5f.bin
762dcdd9ba4f49da9304d24ca69c2c3f9505d1a2d992a25200f0994f7f4993d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5F 16072 bytes

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